List of highways numbered 451

The following highways are numbered 451:

Canada

 * Ontario QEW.svg Ontario Highway 451, commonly called the Queen Elizabeth Way.

Japan

 * Japanese National Route Sign 0451.svg Japan National Route 451

Korea, South

 * Korea Expressway No.451.svg Jungbu Naeryuk Expressway Branch

United Kingdom

 * from Stourbridge to Great Witley

United States

 * Toll Florida 451.svg Florida State Road 451
 * Elongated circle 451.svg Kentucky Route 451
 * Louisiana 451 (2008).svg Louisiana Highway 451
 * MD Route 451.svg Maryland Route 451 (former)
 * New Mexico 451.svg New Mexico State Road 451
 * OR 451.svg Oregon Route 451
 * Ellipse sign 451.svg Puerto Rico Highway 451
 * Tennessee 451.svg Tennessee State Route 451
 * Texas
 * Texas FM 451.svg Farm to Market Road 451
 * WY-451.svg Wyoming Highway 451