The following highways are numbered 31:
International Asian Highway 31 European route E31
Australia Hume Highway Hume Motorway Hume Freeway – South Australia Gorge Road Little Para Road South Para Road Lyndoch Valley Road
Austria Burgenland Schnellstraße Ybbstal Straße
Burma National Highway 31 (Burma)
Canada Alberta Highway 31 British Columbia Highway 31 Manitoba Highway 31 Ontario Highway 31 (former, now Ottawa Road 31) Quebec Autoroute 31 Saskatchewan Highway 31
Cuba Highway 3–31
Czech Republic part of I/31 Highway; Czech: Silnice I/31
France A31 autoroute
Germany Bundesautobahn 31 Bundesstraße 31
Greece EO31 road
Iceland Route 31 (Iceland)
India
Iran
Ireland N31 road (Ireland)
Israel Highway 31 (Israel)
Italy Autostrada A31 (Italy)
Japan Japan National Route 31 Hiroshima-Kure Road
Korea, South National Route 31
Malaysia
Malaysia Federal Route 31
Netherlands A31 motorway (Netherlands)
New Zealand New Zealand State Highway 31
South Africa M31 road (Johannesburg)
Sri Lanka A31 highway (Sri Lanka)
Thailand Vibhavadi Rangsit Road, also known as Superhighway Road or Thailand Route 31
Turkey , a motorway in Turkey running from İzmir to Aydın.
United Kingdom British A31 (Bere Regis-Guilford) A31 road (Isle of Man)
United States Interstate 31 (former) U.S. Route 31 U.S. Route 31W U.S. Route 31E Arkansas Highway 31 California State Route 31 (former) County Route J31 (California) County Route S31 (California) Connecticut Route 31 Florida State Road 31 Georgia State Route 31 Hawaii Route 31 Idaho State Highway 31 Illinois Route 31 Iowa Highway 31 K-31 (Kansas highway) Louisiana Highway 31 Maryland Route 31 Massachusetts Route 31 M-31 (Michigan highway) (former) Minnesota State Highway 31 County Road 31 (Anoka County, Minnesota) County Road 31 (Dakota County, Minnesota) County Road 31 (Hennepin County, Minnesota) County Road 31 (Ramsey County, Minnesota) Missouri Route 31 Nebraska Highway 31 Nevada State Route 31 (former) New Hampshire Route 31 New Jersey Route 31 County Route 31 (Bergen County, New Jersey) County Route S31 (Bergen County, New Jersey) County Route 31 (Monmouth County, New Jersey) County Route 31 (Ocean County, New Jersey) New Mexico State Road 31 New York State Route 31 New York State Route 31F County Route 31 (Dutchess County, New York) County Route 31 (Franklin County, New York) County Route 31 (Greene County, New York) County Route 31 (Livingston County, New York) County Route 31 (Montgomery County, New York) County Route 31 (Niagara County, New York) County Route 31 (Orleans County, New York) County Route 31 (Otsego County, New York) County Route 31 (Suffolk County, New York) County Route 31 (Ulster County, New York) County Route 31 (Wyoming County, New York) North Carolina Highway 31 (former) North Dakota Highway 31 Ohio State Route 31 Oklahoma State Highway 31 Oregon Route 31 Pennsylvania Route 31 South Carolina Highway 31 Tennessee State Route 31 Texas State Highway 31 Texas State Highway Spur 31 Farm to Market Road 31 Texas Park Road 31 Utah State Route 31 Vermont Route 31 Virginia State Route 31 Virginia State Route 31 (1923-1933) (former) Washington State Route 31 West Virginia Route 31 Wisconsin Highway 31 Wyoming Highway 31
Territories Puerto Rico Highway 31
See also A31 (disambiguation)#Roads List of highways numbered 31A List of highways numbered 31B List of highways numbered 31C List of highways numbered 31D List of highways numbered 31E