List of highways numbered 21
For roads named A21 see ; List of A21 roads
Route 21, or Highway 21, can refer to:
International
Australia
Austria
Cambodia
- Road 21 (Cambodia)">Road 21 (Iran)">Road 21 (Cambodia)
Canada
- Alberta Highway 21
- British Columbia Highway 21
- Manitoba Highway 21
- Newfoundland and Labrador Route 21
- Ontario Highway 21
- Prince Edward Island Route 21
- Saskatchewan Highway 21
Costa Rica
Cuba
Czech Republic
Greece
- EO21 road
Hungary
India
Iran
Ireland
Italy
Japan
Korea, South
Moldova
New Zealand
Paraguay
- [Image:R21-PY.svg|20px|] National Route 21
Turkey
- , a motorway in Turkey running from Kemerhisar, Niğde Province to Tarsus, Mersin Province.
United Kingdom
United States
- U.S. Route 21
- Alabama State Route 21
- Arkansas Highway 21
- * Arkansas Highway 21E
- * Arkansas Highway 21W
- California State Route 21
- * County Route A21 (California)
- * County Route E21 (California)
- * County Route G21 (California)
- * County Route J21 (California)
- * County Route S21 (California)
- Colorado State Highway 21
- Connecticut Route 21
- Florida State Road 21
- * County Road 21B (Clay County, Florida)
- * County Road 21B (Duval County, Florida)
- * County Road 21D (Duval County, Florida)
- * County Road 21 (Marion County, Florida)
- * County Road 21 (Putnam County, Florida)
- Georgia State Route 21
- Hawaii Route 21
- Idaho State Highway 21
- Illinois Route 21
- Indiana State Road 21
- Iowa Highway 21
- Kentucky Route 21
- Louisiana Highway 21
- Maryland Route 21
- Massachusetts Route 21
- M-21 (Michigan highway)
- Minnesota State Highway 21
- * County Road 21 (Anoka County, Minnesota)
- * County Road 21 (Hennepin County, Minnesota)
- * County Road 21 (Scott County, Minnesota)
- Mississippi Highway 21
- Missouri Route 21
- Montana Highway 21
- Nebraska Highway 21
- * Nebraska Spur 21B
- * Nebraska Spur 21C
- Nevada State Route 21
- New Jersey Route 21
- * County Route C21 (Bergen County, New Jersey)
- * County Route 21 (Monmouth County, New Jersey)
- New Mexico State Road 21
- New York State Route 21
- * County Route 21 (Allegany County, New York)
- * County Route 21 (Chautauqua County, New York)
- * County Route 21 (Columbia County, New York)
- ** County Route 21B (Columbia County, New York)
- ** County Route 21C (Columbia County, New York)
- * County Route 21 (Delaware County, New York)
- * County Route 21 (Dutchess County, New York)
- * County Route 21 (Erie County, New York)
- * County Route 21 (Essex County, New York)
- * County Route 21 (Genesee County, New York)
- * County Route 21 (Hamilton County, New York)
- * County Route 21 (Herkimer County, New York)
- * County Route 21 (Lewis County, New York)
- * County Route 21 (Oneida County, New York)
- * County Route 21 (Ontario County, New York)
- * County Route 21 (Orange County, New York)
- * County Route 21 (Oswego County, New York)
- * County Route 21 (Otsego County, New York)
- * County Route 21 (Putnam County, New York)
- * County Route 21 (Rensselaer County, New York)
- * County Route 21 (Saratoga County, New York)
- * County Route 21 (Schoharie County, New York)
- * County Route 21 (Suffolk County, New York)
- * County Route 21 (Sullivan County, New York)
- * County Route 21 (Ulster County, New York)
- * County Route 21 (Washington County, New York)
- * County Route 21 (Westchester County, New York)
- * County Route 21 (Wyoming County, New York)
- * County Route 21 (Yates County, New York)
- North Carolina Highway 21
- North Dakota Highway 21
- Ohio State Route 21
- Pennsylvania Route 21
- South Carolina Highway 21 (1920s)
- South Dakota Highway 21
- Tennessee State Route 21
- Texas State Highway 21
- * Texas State Highway Loop 21
- * Farm to Market Road 21
- * Texas Park Road 21
- Utah State Route 21
- State Route 21 (Virginia 1918-1933)
- Washington State Route 21
- * Primary State Highway 21 (Washington)
- * Secondary State Highway 21B (Washington)
- * Secondary State Highway 21C (Washington)
- County Route 21 (Jackson County, West Virginia)
- * County Route 21 (Kanawha County, West Virginia)
- * County Route 21 (Wirt County, West Virginia)
- * County Route 21 (Wood County, West Virginia)
- Wisconsin Highway 21