List of highways numbered 42
The following highways are numbered 42.
International
Australia
- National Route 42 – part of Cunningham Highway
Canada
Alberta
Manitoba
Ontario
- Chatham-Kent Road 42
- Elgin County Road 42
- County Road 42 (Essex County, Ontario)
- 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
China
Greece
Hungary
India
Israel
Japan
Korea, South
Poland
- National Road 42 (Poland)
Thailand
United Kingdom
- English A42 (Appleby Magna-Kegworth)
- Northern Ireland A42 (Maghera-Carnlough)
- British M42 (Appleby Magna-Bromsgrove)
United States
- Interstate 42
- * Interstate 42 (Oklahoma-Arkansas)
- U.S. Route 42
- Alabama State Route 42
- * County Route 42
- Arkansas Highway 42
- California State Route 42
- * County Route J42 (California)
- Colorado State Highway 42
- Connecticut Route 42
- Delaware Route 42
- Florida State Road 42
- * County Road 42 (Lake County, Florida)
- * County Road 42 (Marion County, Florida)
- Georgia State Route 42
- * Georgia State Route 42A
- Illinois Route 42
- * Illinois Route 42A
- Indiana State Road 42
- Iowa Highway 42
- K-42 (Kansas highway)
- Louisiana Highway 42
- * Louisiana State Route 42
- 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
- * Nebraska Spur 42A
- Nevada State Route 42
- 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)
- Oklahoma State Highway 42
- Oregon Route 42
- Pennsylvania Route 42
- South Carolina Highway 42 (1920s)
- South Dakota Highway 42
- Tennessee State Route 42
- Texas State Highway 42
- * Texas State Highway 42 (pre-1939)
- * Texas State Highway Loop 42
- * Texas Park Road 42
- Utah State Route 42
- Virginia State Route 42
- West Virginia Route 42
- Wisconsin Highway 42