# List of highways numbered 42

The following highways are numbered 42.

## International

* AH42 Asian Highway 42
* E42 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 (Essex County, Ontario)
* Greater Sudbury Road 42
* Halton Regional Road 42
* Leeds and Grenville County Road 42 (former Ontario Highway 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 (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)

## Thailand

* Thailand Route 42 (Sadao-Sungai Kolok)

## 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) (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