# List of highways numbered 18

Route 18, or Highway 18, may refer to:

## International

* AH18 Asian Highway 18
* E18 European route E18
* E018 European route E018

## Argentina

* RN 18

## Australia

* Waterfall Way

## Canada

* Alberta Highway 18
* British Columbia Highway 18
* Manitoba Highway 18
* Ontario Highway 18 (former)
* Prince Edward Island Route 18
* Saskatchewan Highway 18

## China

* G18 Expressway

## Costa Rica

* National Route 18

## Cuba

* Highway 2–18

## Czech Republic

* I/18 Highway; Czech: Silnice I/18

## Greece

* EO18 road

## India

* National Highway 18 (India)

## Iran

* Road 18

## Ireland

* M18 motorway (Ireland)
* N18 road (Ireland)

## Italy

* Autostrada A18
* State road 18

## Japan

* Japan National Route 18
* Jōshin-etsu Expressway

## Korea, South

* National Route 18

## New Zealand

* New Zealand State Highway 18

## Paraguay

* National Route 18

## Poland

* Motorway A18
* National road 18

## Russia

* M18 motorway (Russia) running from Saint Petersburg to Murmansk

## South Africa

* N18 road (South Africa)

## Ukraine

* Highway M18 (Ukraine)

## United Kingdom

* British A18 (Doncaster-Ludborough)
* British M18 (Thurcroft-Rawcliffe)

## United States

* U.S. Route 18
* New England Route 18 (former)
* Alabama State Route 18
* Arkansas Highway 18
* California State Route 18
** County route A18 (California)
** County Route E18 (California)
** County Route G18 (California)
** County Route J18 (California)
** County Route S18 (California)
* Colorado State Highway 18 (pre-1968) (former)
* Delaware Route 18
* Florida State Road 18
** County Road 18 (Bradford County, Florida)
** County Road 18 (Columbia County, Florida)
** County Road 18 (Union County, Florida)
* Georgia State Route 18
* Hawaii Route 18 (former)
* Illinois Route 18
* Indiana State Road 18
* K-18 (Kansas highway)
* Kentucky Route 18
* Louisiana Highway 18
* Maine State Route 18 (former)
* Maryland Route 18
* Massachusetts Route 18
* M-18 (Michigan highway)
* Minnesota State Highway 18
** County Road 18 (Anoka County, Minnesota)
** County Road 18 (Scott County, Minnesota)
** County Road 18 (Washington County, Minnesota)
* Mississippi Highway 18
* Missouri Route 18
* Nebraska Highway 18
* Nevada State Route 18 (former)
* New Hampshire Route 18
* New Jersey Route 18
** New Jersey Route 18N (former)
** County Route 18 (Monmouth County, New Jersey)
* New Mexico State Road 18
* New York State Route 18
** County Route 18 (Allegany County, New York)
** County Route 18 (Chautauqua County, New York)
** County Route 18 (Columbia County, New York)
** County Route 18 (Dutchess County, New York)
** County Route 18 (Erie County, New York)
** County Route 18 (Essex County, New York)
** County Route 18 (Herkimer County, New York)
** County Route 18 (Onondaga County, New York)
** County Route 18 (Ontario County, New York)
** County Route 18 (Orange County, New York)
** County Route 18 (Orleans County, New York)
** County Route 18 (Otsego County, New York)
** County Route 18 (Rensselaer County, New York)
** County Route 18 (Schoharie County, New York)
** County Route 18 (Schuyler County, New York)
** County Route 18 (Steuben County, New York)
** County Route 18 (Suffolk County, New York)
** County Route 18 (Tioga County, New York)
** County Route 18 (Washington County, New York)
** County Route 18 (Westchester County, New York)
** County Route 18 (Yates County, New York)
* North Carolina Highway 18
* North Dakota Highway 18
* Ohio State Route 18
* Oklahoma State Highway 18
** Oklahoma State Highway 18B
* Oregon Route 18
* Pennsylvania Route 18
* South Carolina Highway 18
* South Dakota Highway 18 (former)
* Tennessee State Route 18
* Texas State Highway 18
** Farm to Market Road 18
** Ranch to Market Road 18 (former)
* Utah State Route 18
* Vermont Route 18
* Virginia State Route 18
* Washington State Route 18
** Primary State Highway 18 (Washington) (former)
* West Virginia Route 18
* Wisconsin Highway 18 (former)

### Territories

* Guam Highway 18
* Puerto Rico Highway 18

## Zambia

* M18 road (Zambia)