List of highways numbered 171

Canada

• Prince Edward Island Route 171
• Quebec Route 171

  Costa Rica

• National Route 171

  Ireland

• R171 road

  Israel

• Route 171

  Japan

• Japan National Route 171

  Korea, South

• Expressway 171
• * Osan–Hwaseong Expressway
• * Yongin–Seoul Expressway

  United States

• U.S. Route 171
• Alabama State Route 171
• Arkansas Highway 171
• California State Route 171
• Connecticut Route 171
• Florida State Road 171
• Georgia State Route 171
• Illinois Route 171
• K-171
• Kentucky Route 171
• Maine State Route 171
• Maryland Route 171
• M-171
• Minnesota State Highway 171
• Missouri Route 171
• Nevada State Route 171
• New Hampshire Route 171
• New Jersey Route 171
• New Mexico State Road 171
• New York State Route 171
• North Carolina Highway 171
• Ohio State Route 171
• Oklahoma State Highway 171
• Pennsylvania Route 171
• South Carolina Highway 171
• Tennessee State Route 171
• Texas State Highway 171
• *Business State Highway 171-E
• * Texas State Highway Loop 171
• * Farm to Market Road 171
• Utah State Route 171
• Virginia State Route 171
• Washington State Route 171
• Wisconsin Highway 171
• Wyoming Highway 171

• Puerto Rico Highway 171