The following highways are numbered 257:

• Manitoba Provincial Road 257
• Prince Edward Island Route 257
• Quebec Route 257

• National Route 257

• Japan National Route 257

• Alabama State Route 257
• California State Route 257
• Colorado State Highway 257
• Florida State Road 257 (former)
• Georgia State Route 257
• Indiana State Road 257
• K-257 (Kansas highway)
• Kentucky Route 257
• Maryland Route 257
• Minnesota State Highway 257
• Montana Secondary Highway 257
• New York State Route 257
• Ohio State Route 257
• Pennsylvania Route 257
• Tennessee State Route 257
• Texas State Highway 257 (former)
  • Texas State Highway Loop 257
  • Farm to Market Road 257 (Texas)
• Utah State Route 257
• Virginia State Route 257