List of auxiliary Interstate Highways

Dwight D. Eisenhower National System of Interstate and Defense Highways
Dwight D. Eisenhower National System of Interstate and Defense Highways
	Highway shield for Interstate 295
	Interstate Highways in the 48 contiguous states
System information
Formed	June 29, 1956
Highway names
Interstates	Interstate X (I-X)
System links
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future;

Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of highways within the American Interstate Highway System. Auxiliary routes are generally classified as spur routes, which connect to the parent route at one end, bypasses, which connect to the parent route at both ends, or beltways, which form a complete circle intersecting the parent route at two locations. There are 323 auxiliary Interstates in the United States. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat them as bypasses. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway standards (with rare exceptions), and they receive the same percentage of federal funding (90%).

The shorter auxiliary routes branch off main routes and are numbered based on the number of the parent route. All of the supplement routes for Interstate 95 (I-95) are designated with a three-digit number ending in "95" in the form I-x95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer Interstates may have many such supplemental routes, the numbers can repeat from state to state along their route, but they will not repeat within a state.

There are only three states that do not have any auxiliary Interstate Highways: Alaska, Arizona, and New Mexico. North Dakota has an auxiliary route, but it is unsigned, and Wyoming's does not meet Interstate Highway standards.

Terminology and guidelines

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used.

Spur route

A spur route's number usually has an odd number for its first digit.^[2] It is usually one of the following:

It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street/avenue or at a substandard freeway, such as I-185 in Columbus, Georgia.
It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
It may connect two unrelated Interstate highways—as I-390 in New York State and I-355 in Illinois do.
- States differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.
- This may even vary within the same state. For example, in Michigan, both I-196 and I-696 intersect I-96 at one end and I-94 at the other end.

Examples include:

I-110 in California links I-10 with the Port of Los Angeles. This freeway was built before Interstate Highways as the Harbor Freeway. Later, it was adopted into the Interstate Highway System.
I-180 in North-Central Pennsylvania connects Williamsport and Lycoming County with I-80 in Milton, which does not actually enter Lycoming County. I-180 also serves as a connection to those traveling to New York and I-86 via U.S. Route 15 and the Future I-99 Corridor at its western terminus.
I-190 in New York connects the cities of Niagara Falls and Buffalo with I-90.

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples include:

I-380 in Northern California is located at the San Francisco Bay Area. This highway begins at I-280, and it connects with US 101 and San Francisco International Airport.
I-190 in Massachusetts branches off from I-290 near Worcester.
I-795 in Baltimore County, Maryland branches off from I-695.

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.^[2]

Examples include:

I-220 in Louisiana serves as a bypass of downtown Shreveport.
I-440 forms a loop around the south side of Nashville.
I-890 travels through downtown Schenectady, which I-90 avoids.

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs—see Spur route above.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways (and by extension, all primary Interstate Highways), beltways do not have termini; however, they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.^[2]

Some examples of beltways include:

I-275 in Ohio, Kentucky and Indiana encircles the city of Cincinnati.
I-465 in Indiana encircles the city of Indianapolis.
I-495 in Maryland and Virginia encircles the city of Washington, D.C., and is referred to as "The Capital Beltway".

Auxiliary Interstates

Note: this table sorts the route numbers by parent highway.


Number	Length (mi)^[3]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
H-201	4.10	6.60	H-1 in Halawa, HI	H-1 in Honolulu, HI	02004-01-012004^[4]	current	Signed as Route 78 until 2004
I-105	17.32	27.87	SR 1 in El Segundo, CA	I-605 in Norwalk, CA	01963-01-011963	current	Replaced segments of SR 42
I-205	12.97	20.87	I-580 near Tracy, CA	I-5 near Tracy, CA	01970-01-011970	current
I-305	6.00	9.66	I-80 in West Sacramento, CA	I-80 Bus/US 50/SR 99 in Sacramento, CA	01981-01-011981	current	Unsigned
I-405	72.15	116.11	I-5 in Irvine, CA	I-5 in Mission Hills, CA	01964-01-011964	current
I-505	32.98	53.08	I-80 in Vacaville, CA	I-5 in Dunnigan, CA	01977-01-011977	current	Originally part of I-5W
I-605	27.40	44.10	I-405 in Seal Beach, CA	I-210 in Irwindale, CA	01964-01-011964	current
I-805	28.02	45.09	I-5 in San Ysidro, CA	I-5 in Sorrento Valley, CA	01959-01-011959	current
I-905	8.96^[5]	14.42	I-5 in San Ysidro, CA	Fed. 2 at the United States-Mexico border in Otay Mesa, CA	proposed	—	Currently SR 905, proposed to be signed as an Interstate
I-105	3.49	5.62	OR 99 in Eugene, OR	I-5 in Springfield, OR	01958-01-011958	current
I-305	—	—	Pine Street in Salem, OR	I-5 in Keizer, OR	01957-01-011957	01976-01-011976	Canceled
I-405	3.53	5.68	I-5 in Portland, OR	I-5 in Portland, OR	01958-01-011958	current
I-505	3.17	5.10	US 30 in Portland, OR	I-405 in Portland, OR	01969-01-011969	01979-01-011979	Canceled
I-205	36.64	58.97	I-5 in Tualatin, OR	I-5 in Salmon Creek, WA	01958-01-011958	current
I-405	30.30	48.76	I-5/SR 518 in Tukwila, WA	I-5/SR 525 in Lynnwood, WA	01957-01-011957	current
I-605	—	—	WA 99 in Federal Way, WA	I-5 in Everett, WA	—	—	Never built, was planned to bypass Seattle, WA
I-705	1.50	2.41	I-5/SR 7 in Tacoma, WA	Schuster Parkway in Tacoma	01978-01-011978	current
I-210	4.9	7.9	I-10 in Mobile, AL (original southern terminus)	I-65 in Prichard, AL	—	—	Currently I-165, the route number was decommissioned because it had no connection to I-10
I-410	—	—	I-10/I-17 in Phoenix, AZ	I-10 in Phoenix, AZ	—	—	Now part of I-10 in Phoenix, AZ
I-510	—	—	I-10/SR 51 in Phoenix, AZ	SR 101 in Phoenix, AZ	—	—	Currently designated as SR 51 (Piestewa Freeway)
I-710	—	—	I-10 in Tucson, AZ	North Campbell Avenue/East 6th Street in Tucson, AZ	—	—	Mostly never built freeway that was to connect to University of Arizona campus from I-10
I-110	20.43	32.88	SR 47 in San Pedro, CA	I-10/SR 110 in Los Angeles, CA	01978-01-011978	current	Originally part of US 6, then signed as SR 11
I-210	48.72	78.41	I-5 in Sylmar, CA	SR 57/SR 210 in Glendora, CA	01964-01-011964	current	Segment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
I-710	19.66	31.64	Terminal Island in Long Beach, CA	Valley Boulevard in Alhambra, CA	01983-01-011983	current	Originally signed as SR 7
I-110	6.94	11.17	US 98 Bus. near Pensacola, FL	I-10 near Pensacola, FL	01969-01-011969	current
I-110	8.89	14.31	I-10 in Baton Rouge, LA	US 61 in Baton Rouge, LA	01964-01-011964	current
I-210	12.40	19.96	I-10 west of Lake Charles, LA	I-10 east of Lake Charles, LA	01964-01-011964	current
I-310	11.25	18.11	US 90/LA 3127 in Boutte, LA	I-10 west of Kenner, LA	01983-01-011983	current
I-310	2.70	4.35	US 90 Bus. in New Orleans, LA	I-10 in New Orleans, LA	01964-01-011964	01969-01-011969	Canceled Vieux Carré Riverfront Expressway
I-410	1.90	3.06	LA 67 in Baton Rouge, LA	I-10 in Baton Rouge, LA	01961-01-011961	01964-01-011964	Renumbered as I-110
I-410	48.5	78.1	I-10 west of New Orleans, LA	I-10 in New Orleans, LA	01969-01-011969	01977-01-011977	Canceled southern bypass of New Orleans
I-510	3.04	4.89	LA 47 in New Orleans, LA	I-10/LA 47 in New Orleans, LA	01992-01-011992	current
I-610	4.52	7.27	I-10 at Metairie–New Orleans, LA line	I-10 in New Orleans, LA	01965-01-011965	current
I-910	9.70	15.61	US 90 Bus. in Marrero, LA	I-10/US 90 Bus. in New Orleans, LA	01999-01-011999	current	Signed as part of US 90 Bus. and Future I-49
I-110	4.10	6.60	US 90 in Biloxi, MS	I-10 in D'Iberville, MS	01988-01-011988	current
I-310	—	—	US 90 near the Port of Gulfport, MS	I-10 in Gulfport, MS	proposed	—	Future spur into Gulfport, MS
I-110	0.92	1.48	Av Abraham Lincoln at the United States-Mexico border in El Paso, TX	I-10 in El Paso, TX	01967-01-011967	current
I-410	49.49	79.65	Beltway around San Antonio, TX		01959-01-011959	current
I-610	37.97	61.11	Beltway around Houston, TX		01975-01-011975	current
I-215	54.50	87.71	I-15 in Murrieta, CA	I-15 in Devore, CA	01982-01-011982	current	Originally signed as I-15E, then SR 215
I-115	1.19	1.92	I-15/I-90 in Butte, MT	Iron Street in Butte, MT	01971-01-011971	current
I-315	0.83	1.34	I-15 in Great Falls, MT	I-15 Bus/US 89 in Great Falls, MT	01960-01-141960	current	Unsigned
I-215	11.10	17.86	I-15/Clark County Route 215 in Enterprise, NV	I-515/US 93/SR 564 in Henderson, NV	01996-01-011996	current
I-515	20.54	33.06	I-215/I-11/US 93/US 95 in Henderson, NV	I-15/US 93/US 95 in Las Vegas, NV	01976-01-011976	current	Not signed until 1994, this route is entirely concurrent with US 93/US 95; will be decommisioned and replaced by a northward extension of I-11 in 2024
I-215	29.02	46.70	I-80 in Salt Lake City, UT	I-15 in North Salt Lake, UT	01963-01-011963	current
I-415	2.39	3.85	I-80 in Salt Lake City, UT	4430 S in Holladay, UT	01965-01-011965	01969-01-011969	Designation was scrapped to provide a single route number 215 for the entire route.
I-516	6.49	10.44	SR 21/SR 204 in Savannah, GA	SR 21 in Garden City, GA	01985-01-011985	current
I-420	5.40	8.69	I-285 in College Park, GA	I-20 in Atlanta, GA	01983-01-011983	01986-01-011986	Never built, was planned to bypass Atlanta, GA
I-520	23.34	37.56	I-20 in Augusta, GA	I-20 in North Augusta, SC	01980-01-011980	current
I-220	17.62	28.36	I-20/LA 3132 in Shreveport, LA	I-20 in Bossier City, LA	01979-01-011979	current
I-420	10.20	16.42	I-20 in West Monroe, LA	I-20 in Monroe, LA	01957-01-011957	01964-01-011964	Canceled bypass of Monroe
I-220	12.01	19.33	I-20 in Jackson, MS	I-55 in Ridgeland, MS	01981-01-011981	current
I-820	35.17	56.60	I-20 in Fort Worth, TX	I-20/US 287 in Fort Worth, TX	01959-01-011959	current
I-222	—	—	I-22 in Graysville, AL	I-422 in Brookside, AL	proposed	—	Proposed connector between I-422 and I-22 due to the inability to make a direct connection between the two routes.
I-422	—	—	I-20/I-59/I-459/US 11 in Bessemer, AL	I-59 in Argo, AL	proposed	—	Currently under construction; will only be indirectly connected to I-22 via I-222.
I-124	1.97	3.17	I-24 in Chattanooga, TN	US 27 in Chattanooga, TN	01960-01-011960	current	Unsigned
I-225	12.00	19.31	I-25 in Denver, CO	I-70 in Aurora, CO	01976-01-011976	current
I-425	5.31	8.55	I-25/US 36 at Welby, CO	I-70/US 36 at Denver, CO	—	01959-01-011959	Renumbered as I-270 by AASHTO
I-126	3.68	5.92	I-26 in Columbia, SC	US 21/US 76/US 176/US 321 in Columbia, SC	01961-01-011961	current
I-326	5.24	8.43	I-26 in Cayce, SC	SC 48 in Columbia, SC	01976-01-011976	01995-01-011995	Now part of I-77, formerly unsigned
I-526	19.26	31.00	US 17 in Charleston, SC	I-526 Bus./US 17 in Mount Pleasant, SC	01989-01-011989	current
I-129	3.48	5.60	US 20/US 75/US 77 in South Sioux City, NE	I-29/US 20/US 75 in Sioux City, IA	01976-01-011976	current
I-229	14.97	24.09	I-29 in St. Joseph, MO	I-29/US 59/US 71 in St. Joseph, MO	01986-01-011986	current
I-229	11.33	18.23	I-29 in Sioux Falls, SD	I-90 near Sioux Falls, SD	01966-01-011966	current
I-130	5	8.0	I-30/I-49 in Texarkana, AR	US 59/US 71 near Texarkana, AR	02000-01-012000	02014-01-012014	Was given a future designation during its existence due to not being upgraded to Interstate Highway standards; freeway became part of I-49 once completed
I-430	12.93	20.81	I-30/US 67 in Little Rock, AR	I-40/US 65 in Little Rock, AR	01980-01-011980	current
I-530	46.65	75.08	US 65 in Pine Bluff, AR	I-30/I-440 in Little Rock, AR	01999-01-011999	current
I-630	7.40	11.91	I-430 near Little Rock, AR	I-30 in Little Rock, AR	01985-01-011985	current
I-235	13.78	22.18	I-35/I-80 in West Des Moines, IA	I-35/I-80 near Des Moines, IA	01961-01-011961	current
I-135	95.74	154.08	Kansas Turnpike/I-35 in Wichita, KS	I-70/US 81 in Salina, KS	01976-01-011976	current
I-235	16.52	26.59	I-135/US 81 in Wichita, KS	I-135/US 81/K-15/K-254 in Wichita, KS	01965-01-011965	current
I-335	50.13	80.68	I-35/Kansas Turnpike/US 50 in Emporia, KS	I-470/Kansas Turnpike in Topeka, KS	01987-01-011987	current
I-435	80.81	130.05	Beltway around Kansas City, KS, and Kansas City, MO		01965-01-011965	current
I-635	8.90	14.32	I-35 in Overland Park, KS	I-29/US 71 in Kansas City, MO	01968-01-011968	current
I-335	2.74^[6]	4.41	I-94 in Minneapolis, MN	I-35W in Minneapolis, MN	01964-01-011964	01978-01-011978	Canceled
I-535	2.78	4.47	I-35/US 53 in Duluth, MN	US 53/WIS 35 in Superior, WI	01971-01-011971	current
I-235	5.36	8.63	I-35/I-40 in Oklahoma City, OK	I-44 in Oklahoma City, OK	01989-01-011989	current
I-635	37.00	59.55	SH 121 in Grapevine, TX	I-20 in Balch Springs, TX	01959-01-011959	current
I-440	9.96	16.03	I-30/I-530 near Little Rock, AR	I-40/AR 440 near Little Rock, AR	02003-01-012003	current
I-540	15.87	25.54	US 271/AR 253 near Fort Smith, AR	I-40 in Van Buren, AR	01965-01-011965	current
I-140	6.79	10.93	US 17 near Winnabow, NC	I-40/US 17 in Wilmington, NC	02008-01-012008	current
I-240	9.54	15.35	I-26/I-40/US 74 near Asheville, NC	I-40/US 74A in Asheville, NC	01980-01-011980	current
I-440	16.77	26.99	I-40/US 1/US 64 near Cary, NC	I-40 near Raleigh, NC	01991-01-011991	current
I-540	25.84	41.59	I-40 near Durham, NC	I-87/US 64/US 264 near Knightdale, NC	01997-01-011997	current
I-840	21.9	35.2	I-40/I-73/US 421 in Greensboro, NC	I-40/I-85/I-785/I-85 Bus. in Greensboro, NC	02011-01-012011	current
I-240	16.22	26.10	I-44/US 62 in Oklahoma City, OK	I-40/US 270 in Oklahoma City, OK	01965-01-011965	current	Designation planned to be extended to make a complete beltway around Oklahoma City.
I-440	9.96	16.03	I-40/I-240 near Oklahoma City, OK	I-35 in Oklahoma City, OK	—	01975-01-011975	Now part of I-44
I-140	11.17	17.98	I-40 near Farragut, TN	US 129 near Alcoa, TN	01987-01-011987	current
I-240	19.27	31.01	I-40 in Memphis, TN	I-40 in Memphis, TN	01970-01-011970	current
I-440	7.64	12.30	I-40 in Nashville, TN	I-24 in Nashville, TN	01987-01-011987	current
I-640	7.03	11.31	I-40 in Knoxville, TN	I-40 in Knoxville, TN	01982-01-011982	current
I-840	77.28^[7]	124.37	I-40 near Dickson, TN	I-40 near Lebanon, TN	02016-01-012016	current	Originally designated SR 840 until completion
I-244	15.75	25.35	I-44 in Tulsa, OK	I-44 in Tulsa, OK	01970-01-011970	current
I-444	2.51	4.04	I-244 in Tulsa, OK	I-244 in Tulsa, OK	01970-01-011970	current	Unsigned
I-345	1.40	2.25	I-30/I-45 in Dallas, TX	US 75 in Dallas, TX	01973-01-011973	current	Unsigned
I-555	49.80	80.15	I-55 in Turrell, AR	AR 91 in Jonesboro, AR	02016-01-012016	current
I-155	32.13	51.71	I-55 in Lincoln, IL	I-74 in Morton, IL	01992-01-011992	current
I-255	30.82	49.60	I-55/I-270 in Mehlville, MO	I-270/IL 255 in Pontoon Beach, IL	01986-01-011986	current
I-355	32.51	52.32	I-80 in New Lenox, IL	I-290 in Itasca, IL	01989-01-011989	current
I-155	15.93	25.64	I-55 near Hayti, MO	US 51 at Dyersburg, TN	01980-01-011980	current
I-255	—	—	I-55/I-240 in Memphis, TN	I-40 in Memphis, TN	—	—	Now part of I-55 and I-240
I-359	2.30	3.70	I-20/I-59 in southern Tuscaloosa, AL	15th Street in downtown Tuscaloosa, AL	01983-01-011983	current
I-459	32.80	52.79	I-20/I-59 in Bessemer, AL	I-59 in Trussville, AL	01984-01-011984	current
I-759	4.50	7.24	I-59 in Attalla, AL	US 411/SR 759 in Gadsden, AL	01986-01-011986	current
I-164	21.39^[8]	34.42	US 41/Veterans Memorial Parkway in Evansville, IN	I-69 in Evansville, IN	01990-01-011990	02014-01-012014	Decommissioned; now part of I-69^[9]
I-264	22.93	36.90	I-64 in Louisville, KY	I-71 in Louisville, KY	01956-01-011956	current
I-264	25.07	40.35	I-64/I-664 in Chesapeake, VA	Parks Ave in Virginia Beach, VA	01960-01-011960	current
I-464	4.71	7.58	I-64 in Chesapeake, VA	I-264 in Norfolk, VA	01960-01-011960	current
I-564	3.03	4.88	SR 337	I-64 in Norfolk, VA	01970-01-011970	current
I-664	20.21	32.52	I-64/I-264 in Norfolk, VA	I-64 in Hampton, VA	01971-01-011971	current
I-165	4.90	7.89	US 43 in Mobile, AL	I-65 in Mobile, AL	01994-01-011994	current
I-565	21.40	34.44	I-65/US 72/SR 20 in Decatur, AL	US 72 in Huntsville, AL	01991-01-011991	current
I-265	2	3.2	I-40 in Nashville, TN	I-65 in Nashville, TN	—	02000-01-012000	Now part of I-65
I-165	69.684	112.146	I-65 in Bowling Green, KY	US 60/US 231 in Owensboro, KY	02019-01-012019	current	Replaced the William H. Natcher Parkway; originally designated as I-66 Spur in 2008 followed by I-65 Spur in 2015
I-265	24.48	39.40	I-65/I-265/KY 841 in Heritage Creek, KY	I-71/KY 841 in Prospect, KY	01977-01-011977	current	Connected with I-265 in Indiana on December 18, 2016, with the completion of the East End Bridge
I-365	88	142	I-65 near Park City, KY	US 27 in Somerset, KY	proposed	—	Future designation along the Cumberland Parkway
I-165	2.70	4.35	I-65/I-70 in Indianapolis, IN	38th Street in Indianapolis, IN	01978-01-011978	01981-01-011981	Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
I-265	6.73	10.83	I-64 in New Albany, IN	SR 62/I-265 in Clarksville, IN	01977-01-011977	current	Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
I-465	52.79	84.96	Beltway around Indianapolis		01970-01-011970	current
I-865	4.72	7.60	I-65 near Indianapolis, IN	I-465 near Indianapolis	02002-01-012002	current
I-66 Spur	69.684	112.146	I-65 in Bowling Green, KY	US 60/US 231 in Owensboro, KY	02008-01-012008	02015-01-012015	Designation was to replace the William H. Natcher Parkway as part of the proposed I-66 Southern Kentucky Corridor; the route was redesignated as I-65 Spur (which became I-165) when the I-66 project was cancelled
I-266	1.79	2.88	I-66 in Arlington, Virginia	I-66 in Washington, D.C.	—	01972-01-011972	Proposed loop route of I-66 between the District, and Arlington County; if built, would have been the only auxiliary route of I-66; canceled in the face of community opposition during Washington's freeway revolts
I-169	34.27	55.15	I-24 near Hopkinsville, KY	I-69 in Nortonville, KY	02017-05-072017	current	New designation along the former Pennyrile Parkway
I-369	23.441	37.725	I-69/Pennyrile Parkway in Henderson, KY	US 60 in Owensboro, KY	proposed	—	Proposed for designation along Audubon Parkway once upgraded to Interstate standards
I-569	38.446	61.873	I-69/I-169 in Nortonville, KY	I-165 in Beaver Dam, KY	proposed	—	Future designation for the western part of Western Kentucky Parkway once upgraded to Interstate standards
I-269	45.19	72.73	I-55/I-69/MS 304 in Hernando, MS	I-40/SR 385 in Arlington, TN	02015-01-012015	current	Construction completed in October 2018; co-signed with SR 304 in Mississippi; extension to Millington, TN to connect with the proposed I-69 extension planned
I-169	18.7	30.1	US 45W/US 51 in Union City, TN	US 45E/SR 43 in Martin, TN	proposed	—	Proposed for designation along SR 22 once upgraded to Interstate standards
I-469	30.83	49.62	I-69 in Fort Wayne, IN	I-69 in Fort Wayne, IN	01995-01-011995	current
I-169	1.50	2.41	Port of Brownsville main entrance in Brownsville, TX	I-69E/US 77/US 83 in Olmito, TX	02015-01-012015	current	Currently under construction; partially open and co-signed with SH 550
I-369	3.50	5.63	I-30/US 59 in Texarkana, TX	US 59/SH 93 in Texarkana, TX	02013-01-012013	current	Partially completed in 2013
I-270	5.31	8.55	I-25/US 36 at Welby, CO	I-70/US 36 at Denver, CO	01965-01-011965	current
I-470	—	—	Beltway around Denver Metro, CO		—	—	Northwestern portion cancelled due to local opposition; completed segments are designated as SH 470 or E-470
I-270	50.59	81.42	I-55/I-255 in Mehlville, MO	I-55/I-70 near Troy, IL	01956-01-011956	current
I-470	13.72	22.08	I-70 in Topeka, KS	I-70/Kansas Turnpike in Topeka, KS	01960-01-011960	current
I-670	2.81	4.52	I-70 in Kansas City, KS	I-70 in Kansas City, MO	01968-01-011968	current
I-170	2.30	3.70	I-70 in Baltimore, MD	US 40 in Baltimore, MD	01969-01-011969	01983-01-011983	Canceled
I-270	32.60	52.46	I-70 near Frederick, MD	I-495 north of Bethesda, MD	01975-01-011975	current
I-270 Spur	2.10^[10]	3.38	I-270 east of Potomac, MD	I-495 northwest of Bethesda, MD	01975-01-011975	current	Serves as an alternate connector for Virginia travelers
I-370	2.54	4.09	I-270 in Gaithersburg, MD	MD 200 in Derwood, MD	01988-01-011988	current
I-170	11.17	17.98	I-64/US 40 in Richmond Heights, MO	I-270 in Hazelwood, MO	01956-01-011956	current
I-470	16.72	26.91	I-49/I-435 in Kansas City, MO	I-70 in Independence, MO	01983-01-011983	current
I-270	54.97	88.47	Beltway around Columbus, OH		01964-01-011964	current
I-470	6.69	10.77	I-70 near Blaine, OH	I-70 in Elm Grove, WV	01976-01-011976	current
I-670	9.37	15.08	I-70 in Columbus, OH	I-270 near John Glenn Columbus International Airport	02003-01-012003	current
I-271	46.06	74.13	I-71 near Medina, OH	I-90 in Willoughby Hills, OH	01964-01-011964	current
I-471	5.75	9.25	I-275 near Newport, KY	I-71 in Cincinnati, OH	01981-01-011981	current
I-172	19.69	31.69	I-72 in Quincy, IL	US 24 in Quincy, IL	01995-01-011995	current
I-474	14.88	23.95	I-74 in Peoria, IL	I-74 in Morton, IL	01973-01-011973	current
I-274	16.83	27.09	US 158 near Clemmons, NC	Future I-74/Future I-285/US 52 in Bethania, NC	proposed	—	Proposed route in Winston-Salem, NC
I-175	1.44	2.32	I-275 in St. Petersburg, FL	SR 687 in St. Petersburg, FL	01980-01-011980	current
I-275	60.64	97.59	I-75 near Memphis, FL	I-75 in Wesley Chapel, FL	01973-01-011973	current
I-375	1.34	2.16	I-275 in St. Petersburg, FL	US 92 in St. Petersburg, FL	01979-01-011979	current
I-175	—	—	US 82 in Albany, GA	I-75 in Cordele, GA	—	—	Now part of SR 300
I-475	15.83	25.48	I-75 in Macon, GA	I-75 in Macon, GA	01965-01-011965	current
I-575	30.97	49.84	I-75 in Kennesaw, GA	SR 5 west of Nelson, GA	01985-01-011985	current
I-675	11.04	17.77	I-75 in Stockbridge, GA	I-285 southeast of Atlanta, GA	01987-01-011987	current
I-275	83.71	134.72	Beltway around Cincinnati, OH		01962-01-011962	current	Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
I-275	35.01^[11]^{[lower-alpha 1]}	56.34	I-75 near Monroe, MI	I-96, I-696 and M-5 in Farmington Hills, MI	01977-01-011977	current
I-375	1.06	1.71	BS I-375 in Detroit, MI	I-75 in Detroit, MI	01964-01-011964	current	Will be downgraded to a boulevard starting in 2025
I-475	16.99	27.34	I-75 near Grand Blanc, MI	I-75/US 23 near Mount Morris, MI	01973-01-011973	current	Runs east and north of Flint, MI
I-675	7.72	12.42	I-75/US 23 near Saginaw, MI	I-75/US 23 near Zilwaukee, MI	01971-01-011971	current
I-475	20.37	32.78	I-75 in Perrysburg, OH	I-75 in Toledo, OH	01964-01-011964	current
I-675	26.53	42.70	I-75 near Miamisburg, OH	I-70 near Medway, OH	01987-01-011987	current
I-175	—	—	I-75 in Chattanooga, TN	I-75 in Lexington, KY	—	—
I-275	2.98	4.80	I-40 in Knoxville, TN	I-75/I-640 in Knoxville, TN	01982-01-011982	current
I-475	—	—	I-40/I-75 near Knoxville, TN	I-75 near Knoxville, TN	01990-01-141990	—	Canceled due to local opposition and high construction costs
I-676	6.90	11.10	I-76/US 30 in Philadelphia, PA	I-76 in Camden, NJ	01991-01-011991	current
I-176	11.33	18.23	I-76/Pennsylvania Turnpike in Morgantown, PA	US 422 near Reading, PA	01964-01-011964	current
I-276	29.78	47.93	I-76 in King of Prussia, PA	I-95/I-295 in Bristol Township, PA	01964-01-011964	current
I-376	84.42	135.86	I-80 near Hermitage, PA	I-76/US 22 in Monroeville, PA	01972-01-011972	current
I-476	129.61	208.59	I-95 near Chester, PA	I-81/US 6/US 11 near Clarks Summit, PA	01992-01-011992	current
I-876	1.57	2.53	PA 885 in Pittsburgh, PA	I-279/PA 28 in Pittsburgh, PA	01970-01-011970	01971-01-011971	Short lived renumbering of I-479, now I-579
I-277	4.46	7.18	I-77/US 21/US 74/NC 27 in Charlotte, NC	I-77/US 21/NC 16 in Charlotte, NC	01981-01-011981	current	Partial loop around Uptown Charlotte
I-277	4.14	6.66	I-76 in Akron, OH	I-77 in Akron, OH	01970-01-011970	current
I-178	—	—	—	—	—	01971-01-011971	Canceled
I-378	—	—	—	—	01968-01-011968	01971-01-011971	Replaced by PA Route 378
I-278	35.62	57.32	US 1/9 in Linden, NJ	Bruckner Interchange in Bronx, NY	01961-01-011961	current	Does not intersect with parent route I-78
I-478	2.14	3.44	I-278 in Brooklyn, NY	NY 9A in Manhattan, NY	01971-01-011971	current	Unsigned; does not intersect with parent route I-78
I-678	14.33	23.06	John F. Kennedy International Airport in Queens, NY	Bruckner Interchange in Bronx, NY	01965-01-011965	current	Does not intersect with parent route I-78
I-878	0.70	1.13	I-678 in Queens, NY, near John F. Kennedy International Airport	JFK Expressway in Queens, NY, near JFK Airport	01970-01-011970	current	Unsigned; does not intersect with parent route I-78; eastbound only
I-179	—	—	McKean Township, PA	Erie, PA	01958-01-011958	01968-01-011968	Replaced by its parent route, I-79
I-279	13.32	21.44	I-376/US 22/US 30 in Pittsburgh, PA	I-79 in Franklin Park, PA	01972-01-011972	current
I-479	1.57	2.53	PA 885 in Pittsburgh, PA	I-279/PA 28 in Pittsburgh, PA	01966-01-011966	01970-01-011970	Early number for I-579
I-579	1.57	2.53	PA 885 in Pittsburgh, PA	I-279/PA 28 in Pittsburgh, PA	01971-01-011971	current
I-180	—	—	US 101 in San Rafael, CA	I-80 near Berkeley, CA	01978-01-011978	01991-01-011991	Temporary designation of what was formerly part of SR 17, now part of I-580
I-280	57.22	92.09	I-680/US 101 in San Jose, CA	King Street in San Francisco, CA	01964-01-011964	current
I-238	2.23	3.59	I-880 in San Leandro, CA	I-580/SR 238 in Castro Valley, CA	01983-01-011983	current	Considered an auxiliary route of I-80 in California; there is no I-38
I-380	1.671	2.689	I-280 in San Bruno, CA	US 101 in San Bruno, CA	01964-01-011964	current
I-480	—	—	I-80 in San Francisco, CA	Sansome Street in San Francisco, CA	01957-01-011957	01968-01-011968	Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
I-580	75.63	121.71	US 101 in San Rafael, CA	I-5 near Westley, CA	01964-01-011964	current	Segments were originally part of I-5W
I-680	70.52	113.49	I-280/US 101 in San Jose, CA	I-80 in Cordelia, CA	01955-01-011955	current	Originally SR 21
I-780	6.50	10.46	I-80 in Vallejo, CA	I-680 in Benicia, CA	01955-01-011955	current	Originally part of I-680
I-880	47.22	75.99	I-280/SR 17 in San Jose, CA	I-80/I-580 in Oakland, CA	01983-01-011983	current	Originally part of SR 17
I-880	—	—	I-80 in West Sacramento, CA	I-80 in Sacramento, CA	01971-01-011971	01983-01-011983	Now part of I-80
I-980	2.03	3.27	I-880 in Oakland, CA	I-580/SR 24 in Oakland, CA	01981-01-011981	current
I-580	30.09	48.43	US 50 in Carson City, NV	I-80 in Reno, NV	02012-01-012012	current	Runs concurrently with US 395
I-180	13.19	21.23	IL 26/IL 71 in Hennepin, IL	I-80 near Princeton, IL	01969-01-011969	current
I-280	26.98	43.42	I-80 near Davenport, IA	I-74/I-80 near Colona, IL	01990-01-011990	current
I-380	73.05	117.56	I-80 near Iowa City, IA	US 218 in Waterloo, IA	01985-01-011985	current	Connects Waterloo and Cedar Rapids, IA, with I-80
I-480	4.90	7.89	I-80/US 75 in Omaha, NE	I-29/US 6 in Council Bluffs, IA	01966-01-011966	current
I-680	16.49	26.54	I-80 in Omaha, NE	I-29 near Crescent, IA	01966-01-011966	current
I-880	16.57	26.67	I-29 near Loveland, IA	I-80 near Neola, IA	02019-01-012019	current	Former section of I-680
I-180	3.18	5.12	US 34 in Lincoln, NE	I-80/US 34/US 77 in Lincoln, NE	01965-01-011965	current
I-280	—	—	I-80 in Omaha, NE	I-29 near Crescent, IA	01958-01-011958	01965-01-011965	Redesignated as I-680 due to the I-280 already being planned in the Davenport, Iowa area
I-580	1.60	2.57	I-480 in Omaha, NE	Lake Street in Omaha, NE	01976-01-011976	01982-01-011982	Now part of US 75 due to the I-480 interchange not being up to interstate standards
I-280	17.85	28.73	I-80 in Parsippany-Troy Hills, NJ	I-95/New Jersey Turnpike in Kearny, NJ	01958-01-011958	current
I-280	12.41	19.97	I-80/I-90/Ohio Turnpike in Lake Township, OH	I-75 in Toledo, OH	01959-01-011959	current
I-380	—	—	I-76/I-77 in Akron, OH	I-271 in Macedonia, OH	proposed	—	Proposed designation for SR 8 between Akron and Macedonia
I-480	41.77	67.22	I-80/Ohio Turnpike in North Ridgeville, OH	I-80/Ohio Turnpike in Streetsboro, OH	01971-01-011971	current
I-680	16.43	26.44	I-76/Ohio Turnpike in North Lima, OH	I-80/SR 11 near Mineral Ridge, OH	01964-01-011964	current
I-180	28.85	46.43	US 15/US 220 in Williamsport, PA	I-80/PA 147 near Milton, PA	01984-01-011984	current
I-180	—	—	—	—	—	01964-01-011964	Original number for I-176 when I-76 was I-80S
I-280	—	—	—	—	01958-01-011958	01964-01-011964	Now part of Pennsylvania Turnpike
I-380	24.76	39.85	I-80 in Tunkhannock Township, PA	I-81/I-84/US 6 in Dunmore, PA	01973-01-011973	current
I-480	—	—	—	—	01958-01-011958	01964-01-011964	Early number for I-476 when I-76 was I-80S
I-680	—	—	—	—	01958-01-011958	01964-01-011964	Original number for I-676 when I-76 was I-80S
I-180	1.09	1.75	I-80 in Cheyenne, WY	I-80 Bus./US 30 in Cheyenne, WY	01984-01-011984	current	Built as a boulevard, not to Interstate Highway standards
I-281	9.45	15.21	I-81 in Onondaga, NY	New York State Thruway (I-90) in DeWitt, NY	—	01970-01-011970	Redesignated as I-481 on January 1, 1970
I-481	15.04	24.20	I-81 in Onondaga, NY	I-81/NY 481 in North Syracuse, NY	01970-01-011970	current	Will be decommissioned when I-81 is rerouted onto the freeway and the original I-81 routing becomes I-81 Business
I-781	4.30	6.92	I-81 in Pamelia, NY	Fort Drum main gate in Le Ray, NY	02012-01-012012	current
I-381	1.67	2.69	SR 381 in Bristol, VA	I-81 in Bristol, VA	01961-01-011961	current
I-581	6.64	10.69	US 220/SR 24 in Roanoke, VA	I-81 near Hollins, VA	01955-01-011955	current
I-181	23.85	38.38	US 321/SR 67 in Johnson City, TN	US 11W/SR 1 in Kingsport, TN	01985-01-011985	02007-01-012007	Now part of I-26
I-182	15.19	24.45	I-82/US 12 near Richland, WA	US 12/US 395 in Pasco, WA	01969-01-011969	current	Completely concurrent with US 12
I-283	2.91	4.68	I-76/Pennsylvania Turnpike near Highspire, PA	I-83/US 322/Capital Beltway near Harrisburg, PA	01972-01-011972	current
I-184	3.62	5.83	I-84 in Boise, ID	US 20/US 26 in Boise, ID	01990-01-011990	current
I-384	8.20	13.20	I-84/US 6 in East Hartford, CT	US 6/US 44 in Bolton, CT	01984-01-011984	current
I-684	28.47	45.82	I-287 near White Plains, NY	NY 22 near Brewster, NY	01974-01-011974	current	Original routing of I-87; also crosses into Connecticut
I-685	14.00	22.53	I-65 in downtown Montgomery, AL	I-85 in Montgomery, AL	proposed	—	Future designation for I-85 in Montogomery once the Montgomery Outer Loop is completed and I-85 is routed onto it
I-185	49.30	79.34	US 27/US 280/SR 520 in Columbus, GA	I-85 near LaGrange, GA	01979-01-011979	current
I-285	63.98	102.97	Beltway around Atlanta, GA		01969-01-011969	current
I-485	5.9	9.5	I-75/I-85 in Atlanta, GA	I-85 in Atlanta, GA	01964-01-011964	01975-01-011975	Completed section now the Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
I-985	24.04	38.69	I-85 near Buford, GA	SR 369 near Gainesville, GA	01985-01-011985	current
I-285	22.8	36.7	I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC	I-40/US 52/US 311/NC 8 in Winston-Salem, NC	02018-01-012018	current	An unconfirmed section of Future I-285 is to continue north of I-40 for 10 miles (16 km) along US 52, through downtown Winston-Salem, to the proposed Winston-Salem Northern Beltway.^[14]^[15]
I-485	66.68	107.31	Beltway around Charlotte, NC		01988-01-011988	current
I-685	—	—	Greensboro, NC	Dunn, NC	proposed	—	Future designation that will run concurrently with US 421 once the latter route is upgraded to interstate standards
I-785	2.21	3.56	I-40/I-85/I-840/I-85 Bus. in Greensboro, NC	US 70 in Greensboro, NC	02013-01-012013	current	Future northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
I-885	8.566	13.786	I-40/NC 885 in Research Triangle Park, NC	I-85/US 70/US 15 in Durham, NC	02022-01-012022	current
I-185	17.70	28.49	I-385 near Mauldin, SC	US 29 in Greenville, SC	01955-01-011955	current
I-385	42.16	67.85	I-26 near Clinton, SC	US 276 in Greenville, SC	01962-01-011962	current
I-585	2.25	3.62	US 176/US 221/SC 9 in Spartanburg, SC	I-85 Bus./US 176 near Spartanburg, SC	01962-01-011962	current
I-587	55.9	90.0	I-87/US 64 near Zebulon, NC	US 264 near Greenville, NC	02022-01-012022^[16]	current	Former section of US 264; does not currently connect to I-87
I-287	98.72	158.87	I-95/New Jersey Turnpike/Route 440 in Edison, NJ	I-95 in Rye, NY	01961-01-011961	current
I-187	—	—	I-287/New York State Thruway in Greenburgh, NY	I-95 in Rye, NY	01957-01-011957	01958-01-011958	Original designation for the Cross-Westchester Expressway; it was signed as I-487 when it opened
I-487	—	—	I-287/New York State Thruway in Greenburgh, NY	I-95 in Rye, NY	01958-01-011958	01961-01-011961	Original signed designation for the Cross-Westchester Expressway; it was replaced by an extension of I-287
I-487	—	—	I-87/I-287/New York State Thruway in Tarrytown, NY	I-84 in Beacon, NY	01965-01-011965	01971-01-011971	Known as the Hudson River Expressway; the project was cancelled and the only portion to be constructed and opened is now the Croton Expressway
I-587	1.21	1.95	I-87/New York State Thruway/NY 28 in Kingston, NY	NY 28/NY 32 in Kingston, NY	01960-01-011960	current
I-687	9.10	14.65	I-90/New York State Thruway in Colonie, NY	I-90 in Albany	—	01973-01-011973	Also known as the Albany Airport Connector; the project was cancelled in the face of local opposition
I-787	10.16	16.35	I-87/New York State Thruway in Albany, NY	NY 7 in Green Island, NY	01968-01-011968	current
I-189	1.49	2.40	US 7 in South Burlington, VT	I-89 in South Burlington, VT	01980-01-011980	current
I-190	3.07	4.94	O'Hare International Airport in Chicago, IL	I-90 in Chicago, IL	01978-01-011978	current
I-290	29.84	48.02	I-90/IL 53 in Rolling Meadows, IL	I-90/I-94/Ida B. Wells Drive in Chicago, IL	01972-01-011972	current
I-490	—	—	I-294 in Franklin Park, IL	I-90 in Des Plaines, IL	proposed	—	Proposed route number for the O'Hare West Bypass^[17]
I-190	19.26	31.00	I-290 in Worcester, MA	Route 2 in Leominster, MA	01983-01-011983	current
I-290	20.16	32.44	I-395 in Auburn, MA	I-495 in Marlborough, MA	01970-01-011970	current
I-190	28.34	45.61	I-90/New York State Thruway in Cheektowaga, NY	Highway 405 at Lewiston, NY	01959-01-011959	current
I-290	9.80	15.77	I-190 in Tonawanda, NY	I-90/New York State Thruway in Williamsville, NY	01964-01-011964	current
I-390	76.06	122.41	I-86/NY 17 in Avoca, NY	I-490 in Gates, NY	01973-01-011973	current
I-490	37.40	60.19	I-90/New York State Thruway in Bergen, NY	I-90/New York State Thruway in Victor, NY	01970-01-011970	current
I-590	5.31	8.55	I-390 in Brighton, NY	I-490/NY 590 in Rochester, NY	01980-01-011980	current
I-690	14.19	22.84	I-90/New York State Thruway/NY 690 in Van Buren, NY	I-481 in East Syracuse, NY	01962-01-011962	current
I-790	2.41	3.88	I-90/New York State Thruway in Deerfield, NY	NY 5A/NY 55 in Utica, NY	01961-01-011961	current
I-890	9.35	15.05	I-90/New York State Thruway in Rotterdam, NY	I-90/New York State Thruway in Guilderland, NY	01962-01-011962	current
I-990	6.35	10.22	I-290 in Amherst, NY	NY 263 near Lockport, NY	01985-01-011985	current	Highest numbered Interstate in the Interstate system
I-490	2.43	3.91	I-71/I-90 in Cleveland, OH	East 55th Street in Cleveland, OH	01990-01-011990	current
I-190	1.72	2.77	I-90 in Rapid City, SD	US 16 in Rapid City, SD	01962-01-011962	current
I-291	6.02	9.69	I-91 in Windsor, CT	I-84 in Manchester, CT	01994-01-011994	current
I-691	8.38	13.49	I-84 at the Southington-Cheshire, CT town line	I-91 in Meriden, CT	01988-01-011988	current
I-291	5.44	8.75	I-91 in Springfield, MA	I-90/Massachusetts Turnpike in Chicopee, MA	01972-01-011972	current
I-391	4.46	7.18	I-91 in Chicopee, MA	High Street in Holyoke, MA	01970-01-011970	current
I-293	11.18	17.99	I-93/NH 101 in Manchester, NH	I-93/Everett Turnpike in Hooksett, NH	01976-01-011976	current
I-393	4.60	7.40	I-93 in Concord, NH	NH 9 in Pembroke, NH	01979-01-011979	current
I-294	53.42	85.97	I-80/I-94 in South Holland, IL	I-94 in Deerfield, IL	01968-01-011968	current
I-194	3.38	5.44	I-94 in Battle Creek, MI	M-66 in Battle Creek, MI	01961-01-011961	current
I-394	9.75	15.69	I-494/US 12 in Minnetonka, MN	4th Street in Minneapolis, MN	01991-01-011991	current
I-494	42.94	69.11	I-94/I-694 in Maple Grove, MN	I-94/I-694 in Woodbury, MN	01985-01-011985	current	Western and southern half of the Minneapolis–St. Paul beltway
I-694	30.77	49.52	I-94/I-494 in Maple Grove, MN	I-94/I-494 in Woodbury, MN	01970-01-011970	current	Northern and eastern half of the Minneapolis–St. Paul beltway
I-194	1.20	1.93	McKenzie Drive near Bismarck, ND	I-94 near Mandan, ND	01958-01-011958	current	Unsigned
I-794	3.75	6.04	I-43/I-94 in Milwaukee, WI	WIS 794 in Milwaukee, WI	01980-01-011980	current
I-894	4.70	7.56	I-41/I-94 in Milwaukee, WI	I-41/I-43/I-94 in Milwaukee, WI	01966-01-011966	current	Completely concurrent with I-41
I-395	66.60	107.18	I-95 in East Lyme, CT	I-290 in Auburn, MA	01983-01-011983	current
I-295	92.30	148.54	I-95/I-495 in New Castle, DE	I-95 in Bristol Township, PA	01994-01-011994	current	Extended into Pennsylvania in 2018
I-495	11.47	18.46	I-95/I-295 in Newport, DE	I-95 in Lower Chichester Township, PA	01977-01-011977	current
I-895	10.78	17.35	Newport, Delaware	Claymont, Delaware	01979-01-011979^[18]	01980-01-011980^[19]	Now part of I-95
I-195	2.41	3.88	I-395 in Washington D.C.	US 50 in Washington D.C.	proposed	—	Currently I-395; I-395 will be rerouted onto I-695
I-395	13.39	21.55	I-95/I-495 in Springfield, VA	US 50 in Washington, DC	01977-01-011977	current	Original route of I-95 that was proposed to continue through Washington, DC
I-495	64	103	Beltway around Washington, DC		01961-01-011961	current	Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
I-695	2.00	3.22	I-395 in Washington, DC	I-295 in Washington, DC^[20]	01958-01-011958	current	Unsigned until 2011; future plans call for the route number to be replaced by an extension of I-395
I-195	4.42	7.11	I-95/SR 112 in Miami, FL	SR 905 in Miami Beach, FL	01961-01-011961	current
I-295	61.04	98.23	Beltway around Jacksonville, FL		01970-01-011970	current
I-395	1.29	2.08	I-95 in Miami, FL	MacArthur Causeway at Watson Island, Miami, FL	01971-01-011971	current
I-595	12.86	20.70	I-75/SR 869 in Weston, FL	US 1 in Fort Lauderdale, FL	01990-01-011990	current
I-795	7.4	11.9	I-95 south of Jacksonville, FL	I-295 in Jacksonville, FL	proposed	—	Currently signed as SR 9B pending approval of the interstate designation from the AASHTO
I-195	1.55	2.49	I-95/Maine Turnpike in Saco, ME	SR 5 in Saco, ME	01980-01-011980	current
I-295	53.11	85.47	I-95/Maine Turnpike in Scarborough, ME	I-95/Maine Turnpike in Gardiner, ME	01960-01-011960	current
I-395	4.99	8.03	I-95/US 2/SR 100 in Bangor, ME	US 1A in Brewer, ME	02008-01-012008	current
I-495	3.70	5.95	I-95/Maine Turnpike in Portland, ME	I-295/US 1 in Falmouth, ME	02004-01-012004	current	Unsigned
I-195	4.71^[21]	7.58	I-95/MD 166 near Catonsville, MD	Baltimore-Washington International Airport	01990-01-011990	current
I-395	1.98	3.19	I-95 in South Baltimore, MD	West Pratt Street in Baltimore, MD	01981-01-011981	current
I-595	19.97	32.14	I-95/I-495/US 50 near Washington, DC	US 50/US 301/MD 70 in Annapolis, MD	02011-01-012011	current	Unsigned designation for US 50
I-695	30.57	49.20	Beltway around Baltimore, MD		01958-01-011958	current
I-795	8.99	14.47	I-695 in Pikesville, MD	MD 140 in Reisterstown, MD	01985-01-011985	current
I-895	11.44	18.41	I-95 near Elkridge, MD	I-95 in Baltimore, MD	01979-01-011979	current
I-295	8.05	12.96	I-95/I-495 near Forest Heights, MD	I-695 in Washington, DC	01964-01-011964	current
I-195	44.55	71.70	I-95 in Providence, RI	I-495/Route 25 in Wareham, MA	01958-01-011958	current
I-295	26.58	42.78	I-95 in Warwick, RI	I-95 in Attleboro, MA	01969-01-011969	current
I-495	121.56	195.63	I-195/Route 25 in Wareham, MA	I-95 in Salisbury, MA	01957-01-011957	current
I-695	—	—	I-95 in Roxbury, MA	I-93 in Charlestown, MA	01955-01-011955	01971-01-011971	Canceled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
I-895	—	—	Route 37/I-295 in Cranston, RI	I-95/I-295 in Attleboro, MA	01968-01-011968	01982-01-011982	Canceled; would have supplemented I-295 to create a full Beltway around Providence, RI
I-195	34.17	54.99	I-295 in Hamilton Township, NJ	Route 34 in Wall Township, NJ	01968-01-011968	current
I-895	—	—	I-295 in Burlington, NJ	I-95 in Bristol, PA	01963-01-011963	01981-01-011981	Never built
I-295	9.79	15.76	NY 25/NY 24 in Queens, NY	Bruckner Interchange in Bronx, NY	01970-01-011970	current
I-495	71.02	114.30	Queens Midtown Tunnel in Manhattan, NY	CR 58 in Riverhead, NY	01958-01-011958	current
I-695	1.77	2.85	I-95 in Bronx, NY	I-295 in Bronx, NY	01986-01-011986	current
I-895	1.12	1.80	I-278 in Bronx, NY	I-95 in Bronx, NY	01970-01-011970	02017-01-012017^[22]	Downgraded to a boulevard and designated as NY 895
I-295	34.0	54.7	Cliffdale Road in Fayetteville, NC	I-95 and US 13 near Eastover, NC	02019-01-012019	current	Unfinished Fayetteville Outer Loop; expected to be completed in its entirety in Summer 2026
I-495	4.10	6.60	I-440/US 64/US 64 Bus. in Raleigh, NC	I-540/US 64/US 264 in Knightdale, NC	02013-01-012013	02017-01-012017	Now part of I-87
I-795	25.46	40.97	US 70/US 117 in Goldsboro, NC	I-95/US 264 in Wilson, NC	02007-01-012007	current
I-695	—	—	I-95 near Philadelphia International Airport	I-95 in Philadelphia, PA	01964-01-011964	01977-01-011977	Never built
I-195	3.24	5.21	SR 195 in Richmond, VA	I-64/I-95 in Richmond, VA	01970-01-011970	current
I-295	52.56	84.59	I-95 near Petersburg, VA	I-64 near Short Pump, VA	01980-01-011980	current
I-595	—	—	I-395 near Arlington, VA	US 1 at Ronald Reagan Washington National Airport	—	—	Now part of US 1
I-895	—	—	I-95 near Richmond, VA	I-295 near Richmond, VA	01996-01-011996	02002-01-012002	Currently designated as SR 895, it was originally planned as an Interstate designation, but did not get approved by AASHTO
I-495	—	—	—	—	01956-01-011956	01958-01-011958	Early number of I-476
I-196	37.07^[11]	59.66	US 31 in Norton Shores, MI	I-96/US 16 in Grand Rapids, MI	01959-01-011959	01963-01-011963	Now the western end of I-96
I-196	80.65	129.79	I-94/US 31 near Benton Harbor, MI	I-96/M-37 in Grand Rapids, MI	01963-01-011963	current
I-296	3.43	5.52	I-196 in Grand Rapids, MI	I-96/M-37 in Walker, MI	01962-01-011962	current	Unsigned since 1979
I-496	11.78	18.96	I-69/I-96 near Lansing, MI	I-96 and US 127 near Lansing, MI	01970-01-011970	current
I-696	29.39	47.30	I-96/I-275 & M-5 in Novi, MI	I-94 in Roseville, MI	01989-01-011989	current
I-197	3.44	5.54	—	—	—	01980-01-01c. 1980	Replaced by I-595
I-297	—	—	—	—	—	01987-01-011987	Withdrawn from request, replaced by MD 3
Former Proposed and unbuilt

Notes

↑ According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.^[3] MDOT and most major map publishers do count the overlap.^[11]^[12]^[13]

References

↑ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
1 2 3 DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.
1 2 Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.
↑ Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 16, 2017.
↑ Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.
↑ Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
↑ Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.
↑ Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.
↑ Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Archived from the original (PDF) on March 4, 2016. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.
↑
Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
- Montgomery County (PDF).
1 2 3 Michigan Department of Transportation (2021). Next Generation PR Finder (Map). Michigan Department of Transportation. Retrieved October 11, 2021.
↑ Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.
↑ Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.
↑ "Ask SAM: Upgrades needed before US 52 can be called I-285". Winston-Salem Journal. January 10, 2014. Retrieved January 10, 2014.
↑ "NCDOT: Project U-2826". Archived from the original on October 29, 2011. Retrieved April 17, 2014.
↑ "State Seeking Future Interstate Designation for US 264 to Greenville" (Press release). North Carolina Governor's Office. Archived from the original on November 10, 2016. Retrieved November 10, 2016.
↑ Borggren, Erica J. (October 6, 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on March 3, 2016.
↑ Special Committee on U.S. Route Numbering (June 25, 1979). "Route Numbering Committee Agenda Showing Action Taken by the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 501. Retrieved November 13, 2014 – via Wikimedia Commons.
↑ Special Committee on U.S. Route Numbering (November 14, 1980). "Route Numbering Committee Agenda" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 519. Retrieved November 13, 2014 – via Wikimedia Commons.
↑ DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.
↑
Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
- Anne Arundel County (PDF). pp. 6–7.
- Baltimore County (PDF). pp. 18–20, 162.
↑ Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Archived from the original (PDF) on June 3, 2019. Retrieved October 21, 2017.

External links

Geographic data related to List of auxiliary Interstate Highways at OpenStreetMap
3-digit Interstates at Kurumi.com

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[14] According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.^[3] MDOT and most major map publishers do count the overlap.^[11]^[12]^[13]

[FAHA56-1] Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.

[fhwamain-2] 1 2 3 DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.

[fhwa-3] 1 2 Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.

[AASHTO90A-4] Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 16, 2017.

[calnexus905-5] Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.

[cavanaugh-6] Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.

[840hold-7] Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.

[fhwa2002-8] Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.

[9] Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Archived from the original (PDF) on March 4, 2016. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.

[MarylandHLR-10] Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
Montgomery County (PDF).

[mwAUY] Montgomery County (PDF).

[PRFA-11] 1 2 3 Michigan Department of Transportation (2021). Next Generation PR Finder (Map). Michigan Department of Transportation. Retrieved October 11, 2021.

[RM-12] Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.

[google-13] Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.

[15] "Ask SAM: Upgrades needed before US 52 can be called I-285". Winston-Salem Journal. January 10, 2014. Retrieved January 10, 2014.

[U-2826-16] "NCDOT: Project U-2826". Archived from the original on October 29, 2011. Retrieved April 17, 2014.

[17] "State Seeking Future Interstate Designation for US 264 to Greenville" (Press release). North Carolina Governor's Office. Archived from the original on November 10, 2016. Retrieved November 10, 2016.

[18] Borggren, Erica J. (October 6, 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on March 3, 2016.

[aashto1979S-19] Special Committee on U.S. Route Numbering (June 25, 1979). "Route Numbering Committee Agenda Showing Action Taken by the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 501. Retrieved November 13, 2014 – via Wikimedia Commons.

[aashto1980A-20] Special Committee on U.S. Route Numbering (November 14, 1980). "Route Numbering Committee Agenda" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 519. Retrieved November 13, 2014 – via Wikimedia Commons.

[21] DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.

[Maryland_HLR195-22] Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
Anne Arundel County (PDF). pp. 6–7.

Baltimore County (PDF). pp. 18–20, 162.

[mwAb8] Anne Arundel County (PDF). pp. 6–7.

[mwAcc] Baltimore County (PDF). pp. 18–20, 162.

[23] Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Archived from the original (PDF) on June 3, 2019. Retrieved October 21, 2017.

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Primary Interstate Highways
Signed	2 4 5 8 10 11 12 14 15 16 17 19 20 22 24 25 26 27 29 30 35 37 39 40 41 43 44 45 49 55 57 59 64 65 66 68 69 70 71 72 73 74 75 76 CO–NE OH–NJ 77 78 79 80 81 82 83 84 OR–UT PA–MA 85 86 ID PA–NY CT–MA 87 NC NY 88 IL NY 89 90 91 93 94 95 96 97 99 H-1 H-2 H-3
Unsigned	A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists	Primary Auxiliary Suffixed Business Future
Other	Standards Gaps Tolled
Routes in italics are no longer a part of the system. Major Interstates are highlighted.

Terminology and guidelines

Spur route

Bypass

Beltway

Auxiliary Interstates

See also

Notes

References

External links