The following highways are numbered 231:

• Manitoba Provincial Road 231
• Newfoundland and Labrador Route 231
• Prince Edward Island Route 231
• Quebec Route 231

• National Route 231

• National Highway 231 (India)

• Japan National Route 231

• A231 highway (Nigeria)

• U.S. Route 231
• Arkansas Highway 231
• California State Route 231 (former)
• Colorado State Highway 231
• Florida State Road 231
• Georgia State Route 231
• K-231 (Kansas highway)
• Kentucky Route 231 (former)
• Maine State Route 231
• Maryland Route 231
• M-231 (Michigan highway)
• Minnesota State Highway 231 (former)
• Missouri Route 231
• Montana Secondary Highway 231
• Nevada State Route 231
• New Mexico State Road 231
• New York State Route 231
• North Carolina Highway 231
• Ohio State Route 231
• Oregon Route 231 (former)
• Pennsylvania Route 231
• South Dakota Highway 231
• Tennessee State Route 231
• Texas State Highway 231
  • Texas State Highway Loop 231
  • Texas State Highway Spur 231
• Utah State Route 231
• Virginia State Route 231
• Wyoming Highway 231