List of highways numbered 42
The following highways are 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
Greece
- EO42 road
Hungary
- Main road 42
India
- National Highway 42
Israel
- Highway 42
Japan
- Japan National Route 42
- Hanwa Expressway
- Kisei Expressway
Korea, South
- National Route 42
Poland
- National Road 42
Thailand
- Thailand Route 42
United Kingdom
- English A42
- Northern Ireland A42
- British M42
United States
- Interstate 42
- * Interstate 42
- U.S. Route 42
- Alabama State Route 42
- * County 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