List of highways numbered 91
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
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
- Arkansas Highway 91
- California State Route 91
- Colorado State Highway 91
- Florida State Road 91
- Georgia State Route 91
- * Georgia State Route 91W
- Illinois Route 91
- Iowa Highway 91
- Kentucky Route 91
- Louisiana Highway 91
- * Louisiana State Route 91
- Maine State Route 91
- Maryland Route 91
- *Maryland Route 91A
- M-91
- Minnesota State Highway 91
- * County Road 91
- Missouri Route 91
- Nebraska Highway 91
- * Nebraska Link 91D
- * Nebraska Spur 91A
- * Nebraska Spur 91B
- Nevada State Route 91
- New Jersey Route 91
- * County Route 91
- New Mexico State Road 91
- New York State Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- * County Route 91
- North Carolina Highway 91
- North Dakota Highway 91
- Ohio State Route 91
- Oklahoma State Highway 91
- Pennsylvania Route 91
- 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
- Virginia State Route 91
- Wisconsin Highway 91
- Wyoming Highway 91
Vietnam
- National Road 91