Geology

Calciferous mica schist underlies much of the county. There is argillaceous slate running through Waterford and Kirby, which narrows in Burke.^[11]

Waterford had a lot of talc. This belongs to the gold bearing formations. Specimens of gold were found in town, and iron and copper pyrites in veins. But none in commercial quality. In Waterford there was an outcrop of slate that was quarried for roofing. Kirby Mountain, in Kirby, was largely granite of commercial quality.^[11]

Ryegate had 300 acres (120 ha) granite on the south and west sides of Blue Mountain. The granite was created by volcanic action. This was a medium colored granite of commercial grain and texture. It was quarried in the 19th century. It lay in sheets 3 inches (76 mm) to 10 feet (3.0 m) or 15 feet (4.6 m).^[11]

Perhaps the most widely known monument locally using this granite was the soldiers monument at Peacham, Vermont. Monuments from this granite exist all over the country. This was one of the best quality quarries in the country in the 19th century.^[11]

The presence of Kame terraces in the country are of interest in connection with the drift that gave the Northeast Kingdom its soil, and its surface stones and boulders. These terraces have beds of sand and clay from which bricks were once manufactured.^[11]

Based on research by Edward Hitchcock two or three basins can be identified based on a larger number of interconnected terraces in the Passumpsic River Valley.^[11]

The first extends from the mouth of the Passumpsic River in Barnet, to the northwest corner of the town of Waterford, on the railroad. It is about 4 miles (6.4 km) long. The river runs through a narrow valley in Barnet, a gorge with no terraces. Narrow terraces in the Town of Passumpsic expand and form a basin. The fourth terrace on the west side of the river is part of the next basin, which is in St. Johnsbury and Lyndon. St. Johnsbury Village is on this high terrace which is called "St. Johnsbury Plain". The base of the terraces at St. Johnsbury is composed of clay. The same terrace occurs on both sides of the river valley beyond Lyndon. There are lower terraces at intervals.^[11]

Lyndonville has a high terrace. This may have once extended across the valley to form the end of a basin. Its lower strata are clayey, and are folded and curved. West of this terrace the level is lower. There is the course of a former river bed which ran towards the east. At the upper village of Lyndon the first terrace is about 1 mile (1.6 km) wide. There is a lot of sand and fine gravel adjoining.^[11]

Every stream from either side of the valley has its large terraces to correspond with those of the Passumpsic River. It is a characteristic of these terraces that they are large while their quantity is small. The count never exceeds five which is unusual.^[11]

The third basin includes the east branch of the Passumpsic River which runs through the Town of Burke. In East Burke there are several terraces. Near the village there are four on the west side, and two on the east side. Above East Burke the valley rises so that its bottom appears like a terrace. Its steep slope crosses the valley at right angles. There are indistinct terraces on its sides. Since the valley seems to be too wide to correspond with the size of the river, the valley may have been formed by water from unknown sources in prehistoric times.^[11]

Caledonia has more muck deposits than any other county in the state. This was once thought to be profitable for farmers.^[11]

Adjacent counties

• Orleans County – north
• Essex County – northeast
• Grafton County, New Hampshire – southeast
• Washington County – southwest
• Orange County – south
• Lamoille County – west

2010 census

As of the 2010 United States Census, there were 31,227 people, 12,553 households, and 8,153 families residing in the county.^[16] The population density was 48.1 inhabitants per square mile (18.6/km²). There were 15,942 housing units at an average density of 24.6 per square mile (9.5/km²).^[17] Of the 12,553 households, 29.4% had children under the age of 18 living with them, 49.7% were married couples living together, 10.1% had a female householder with no husband present, 35.1% were non-families, and 27.5% of all households were made up of individuals. The average household size was 2.38 and the average family size was 2.86. The median age was 42.1 years.^[16]

The median income for a household in the county was $42,706 and the median income for a family was $51,503. Males had a median income of $40,223 versus $30,707 for females. The per capita income for the county was $22,504. About 9.6% of families and 13.5% of the population were below the poverty line, including 15.6% of those under age 18 and 13.0% of those age 65 or over.^[18]

Elections

In 1828, Caledonia County voted for National Republican Party candidate John Quincy Adams.

In 1832, the county was won by Anti-Masonic Party candidate William Wirt.

From William Henry Harrison in 1836 to Winfield Scott in 1852, the county would vote the Whig Party candidates.

From John C. Frémont in 1856 to Richard Nixon in 1960 (barring 1912, where the county was won by Progressive Party candidate and former president Theodore Roosevelt), the Republican Party would have a 104-year winning streak in the county.

In 1964, the county was won by Democratic Party incumbent President Lyndon B. Johnson, who became not only the first Democratic presidential candidate to win the county, but to win the state of Vermont entirely.

Following the Democrats' victory in 1964, the county went back to voting for Republican candidates for another 20 year winning streak starting with Richard Nixon in 1968 and ending with George H. W. Bush in 1988.

The county would be won by Bill Clinton in both the 1992 and 1996 presidential elections.

George W. Bush would win the county in 2000 and would be the last time a Republican presidential candidate would carry the county.

John Kerry won the county in 2004 and it has been won by Democratic candidates ever since.

Airport

The Caledonia County Airport is located in Lyndon, Vermont.^[23]

Major highways

• Interstate 91
• Interstate 93
• U.S. Route 2
• U.S. Route 5
• U.S. Route 302

Towns

Villages

Incorporated villages are census divisions and provide additional services. They remain part of the towns they are in. Cities are formed when villages become large enough to warrant greater governmental organization, and become separate from the surrounding town.

Census-designated places