The following highways are numbered 91:
International 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
Greece EO91 road
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 County Route 91 (Lee County, Alabama) 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