The following highways are numbered 42.
International
Asian Highway 42
E42 European route E42
Asian Highway 42
Australia
National Route 42 - part of Cunningham Highway
National Route 42 - part of Canada
Alberta
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Manitoba
- Manitoba Highway 42
- Winnipeg Route 42
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
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Saskatchewan
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China
G42 Expressway
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Hungary
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Main road 42 (Hungary)
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India
National Highway 42 (India)
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Israel
Highway 42 (Israel)
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Japan
Japan National Route 42.png)
Hanwa Expressway- Kisei Expressway
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Hanwa ExpresswayKorea, South
National Route 42
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Poland
National Road 42 (Poland)
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United Kingdom
English A42 (Appleby Magna-Kegworth)- Northern Ireland A42 (Maghera-Carnlough)
British M42 (Appleby Magna-Bromsgrove)
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United States
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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 .svg.png)
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 .svg.png)
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.svg.png)
North Dakota Highway 42.svg.png)
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
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- Territories
- Puerto Rico Highway 42
- U.S. Virgin Islands Highway 42
See also
- 42nd Street (disambiguation)
- A42 (disambiguation)#Roads
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