The following highways are numbered 91:

International

• E91 European route E91

Australia

• Cairns Western Arterial Road
• Summerland Way

Brasil

• SP-91, state highway in Sao Paulo

Canada

• British Columbia Highway 91
  • British Columbia Highway 91A
• Newfoundland and Labrador Route 91

China

• G91 Expressway

Iran

• Road 91

Israel

• Highway 91 (Israel)

Italy

• Autostrada A91

Greece

• Greek National Road 91

Korea, South

• National Route 91

United States

• Interstate 91
• U.S. Route 91
• Alabama State Route 91
• Arkansas Highway 91
• California State Route 91
• Colorado State Highway 91
• Florida State Road 91 (unsigned designation for Florida's Turnpike)
• Georgia State Route 91
  • Georgia State Route 91W (former)
• Illinois Route 91
• Iowa Highway 91
• Kentucky Route 91
• Louisiana Highway 91
  • Louisiana State Route 91 (former)
• Maine State Route 91
• Maryland Route 91
  • Maryland Route 91A (former)
• M-91 (Michigan highway)
• Minnesota State Highway 91
  • County Road 91 (St. Louis County, Minnesota)
• Missouri Route 91
• Nebraska Highway 91
  • Nebraska Link 91D
  • Nebraska Spur 91A
  • Nebraska Spur 91B
• Nevada State Route 91 (1959) (former)
• New Jersey Route 91
  • County Route 91 (Bergen County, New Jersey)
• New Mexico State Road 91
• New York State Route 91
  • County Route 91 (Herkimer County, New York)
  • County Route 91 (Monroe County, New York)
  • County Route 91 (Niagara County, New York)
  • County Route 91 (Oneida County, New York)
  • County Route 91 (Onondaga County, New York)
  • County Route 91 (Rensselaer County, New York)
  • County Route 91 (Saratoga County, New York)
  • County Route 91 (Schenectady County, New York)
  • County Route 91 (Suffolk County, New York)
  • County Route 91 (Sullivan County, New York)
• North Carolina Highway 91
• North Dakota Highway 91
• Ohio State Route 91
• Oklahoma State Highway 91
• Pennsylvania Route 91 (former)
• Rhode Island Route 91
• Tennessee State Route 91
• Texas State Highway 91
  • Texas State Highway Spur 91
  • Farm to Market Road 91
• Utah State Route 91 (1935–1969) (former)
• Virginia State Route 91
• Wisconsin Highway 91
• Wyoming Highway 91

Vietnam

• National Road 91 (Vietnam)

See also

• A91 road