List of highways numbered 173

Canada

• Prince Edward Island Route 173
• Quebec Route 173

  India

• National Highway 173

  Ireland

• R173 road

  Japan

• Japan National Route 173

  Korea, South

• Iksan–Pyeongtaek Expressway Branch

  Philippines

• National Route 173

  United States

• Alabama State Route 173
• Arizona State Route 173
• California State Route 173
• Connecticut Route 173
• Florida State Road 173
• Georgia State Route 173
• Illinois Route 173
• Iowa Highway 173
• K-173
• Kentucky Route 173
• Louisiana Highway 173
• Maine State Route 173
• Maryland Route 173
• M-173
• Missouri Route 173
• New Jersey Route 173
• New Mexico State Road 173
• New York State Route 173
• Ohio State Route 173
• Oregon Route 173
• Pennsylvania Route 173
• South Carolina Highway 173
• Tennessee State Route 173
• Texas State Highway 173
• * Texas State Highway Loop 173
• * Farm to Market Road 173
• Utah State Route 173
• Virginia State Route 173
• Washington State Route 173
• Wisconsin Highway 173
• Wyoming Highway 173

• Puerto Rico Highway 173