The following highways are numbered 42.

International

• AH42 Asian Highway 42
• E42 European route E42

Australia

• National Route 42 – part of Cunningham Highway

Canada

China

• G42 Expressway

Hungary

• Main road 42 (Hungary)

India

• National Highway 42 (India)

Israel

• Highway 42 (Israel)

Japan

• Japan National Route 42
• Hanwa Expressway
• Kisei Expressway

Korea, South

• National Route 42

Poland

• National Road 42 (Poland)

United Kingdom

• English A42 (Appleby Magna-Kegworth)
• Northern Ireland A42 (Maghera-Carnlough)
• British M42 (Appleby Magna-Bromsgrove)

United States

• Interstate 42 (proposed)
• U.S. Route 42
• Alabama State Route 42 (former)
• Arkansas Highway 42
• California State Route 42 (former)
  • County Route J42 (California)
• Colorado State Highway 42
• Connecticut Route 42
• Delaware Route 42
• Florida State Road 42 (former)
  • County Road 42 (Lake County, Florida)
  • County Road 42 (Marion County, Florida)
• Georgia State Route 42
  • Georgia State Route 42A (former)
• Illinois Route 42 (former)
  • Illinois Route 42A (former)
• Indiana State Road 42
• Iowa Highway 42 (former)
• K-42 (Kansas highway)
• Louisiana Highway 42
  • Louisiana State Route 42 (former)
• Maryland Route 42
  • Maryland Route 42A
• M-42 (Michigan highway)
• Minnesota State Highway 42
  • County Road 42 (Dakota County, Minnesota)
  • County Road 42 (Ramsey County, Minnesota)
  • County Road 42 (Scott County, Minnesota)
• Mississippi Highway 42
• Missouri Route 42
• Montana Highway 42
• Nebraska Highway 42 (former)
  • Nebraska Spur 42A
• Nevada State Route 42 (former)
• New Jersey Route 42
  • County Route 42 (Bergen County, New Jersey)
  • County Route 42 (Monmouth County, New Jersey)
• New Mexico State Road 42
• New York State Route 42
  • County Route 42 (Allegany County, New York)
  • County Route 42 (Cattaraugus County, New York)
  • County Route 42B (Cayuga County, New York)
  • County Route 42 (Chautauqua County, New York)
  • County Route 42 (Chenango County, New York)
  • County Route 42 (Dutchess County, New York)
  • County Route 42 (Erie County, New York)
  • County Route 42 (Genesee County, New York)
  • County Route 42 (Herkimer County, New York)
  • County Route 42 (Livingston County, New York)
  • County Route 42 (Madison County, New York)
  • County Route 42 (Putnam County, New York)
  • County Route 42 (Rensselaer County, New York)
  • County Route 42 (Rockland County, New York)
  • County Route 42 (Schoharie County, New York)
  • County Route 42 (St. Lawrence County, New York)
  • County Route 42 (Suffolk County, New York)
  • County Route 42 (Ulster County, New York)
  • County Route 42 (Warren County, New York)
  • County Route 42 (Washington County, New York)
  • County Route 42 (Wyoming County, New York)
• North Carolina Highway 42
• North Dakota Highway 42
• Ohio State Route 42 (1923-1927) (former)
• Oklahoma State Highway 42
• Oregon Route 42
• Pennsylvania Route 42
• South Carolina Highway 42 (1920s) (former)
• South Dakota Highway 42
• Tennessee State Route 42 (former)
• Texas State Highway 42
  • Texas State Highway 42 (pre-1939) (former)
  • Texas State Highway Loop 42
  • Texas Park Road 42
• Utah State Route 42
• Virginia State Route 42
• West Virginia Route 42
• Wisconsin Highway 42

Territories

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

See also

• 42nd Street (disambiguation)
• A42 (disambiguation)#Roads