List of highways numbered 42

International

• Asian Highway 42
• European route E42

  Australia

• National Route 42 - part of Cunningham Highway

  Canada

Alberta

• Alberta Highway 42

  Manitoba

• Manitoba Highway 42
• Winnipeg Route 42

  Ontario

• Chatham-Kent Road 42
• Elgin County Road 42
• County Road 42
• Greater Sudbury Road 42
• Halton Regional Road 42
• Leeds and Grenville County Road 42
• Middlesex County Road 42
• Muskoka Road 42
• Niagara Regional Road 42
• Norfolk County Road 42
• Ottawa Road 42
• Renfrew County Road 42
• Simcoe County Road 42
• Wellington County Road 42

  Saskatchewan

• Saskatchewan Highway 42

  China

• G42 Expressway

  Hungary

• Main road 42

  India

• National Highway 42

  Israel

• Highway 42

  Japan

• Route 42
• Hanwa Expressway
• Kisei Expressway

  Korea, South

• National Route 42

  Poland

• National Road 42

  United Kingdom

• English A42
• Northern Ireland A42
• British M42

  United States

• Interstate 42
• U.S. Route 42
• Alabama State Route 42
• Arkansas Highway 42
• California State Route 42
• * County Route J42
• Colorado State Highway 42
• Connecticut Route 42
• Delaware Route 42
• Florida State Road 42
• * County Road 42
• * County Road 42
• Georgia State Route 42
• * Georgia State Route 42A
• Illinois Route 42
• * Illinois Route 42A
• Indiana State Road 42
• Iowa Highway 42
• K-42
• Louisiana Highway 42
• * Louisiana State Route 42
• Maryland Route 42
• *Maryland Route 42A
• M-42
• Minnesota State Highway 42
• * County Road 42
• * County Road 42
• * County Road 42
• Mississippi Highway 42
• Missouri Route 42
• Montana Highway 42
• Nebraska Highway 42
• * Nebraska Spur 42A
• Nevada State Route 42
• New Jersey Route 42
• * County Route 42
• * County Route 42
• New Mexico State Road 42
• New York State Route 42
• * County Route 42
• * County Route 42
• *County Route 42B
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• * County Route 42
• North Carolina Highway 42
• North Dakota Highway 42
• Ohio State Route 42
• Oklahoma State Highway 42
• Oregon Route 42
• Pennsylvania Route 42
• South Carolina Highway 42
• South Dakota Highway 42
• Tennessee State Route 42
• Texas State Highway 42
• * Texas State Highway 42
• * Texas State Highway Loop 42
• * Texas Park Road 42
• Utah State Route 42
• Virginia State Route 42
• West Virginia Route 42
• Wisconsin Highway 42

• Puerto Rico Highway 42
• U.S. Virgin Islands Highway 42