List of highways numbered 423

The following highways are numbered 423:

Canada

 * Manitoba Provincial Road 423

Japan

 * Japanese National Route Sign 0423.svg Japan National Route 423

United States

 * Florida 423.svg Florida State Road 423
 * Orange County Road 423 FL.svgOsceola County Road 423 FL.svg County Road 423 (Florida)
 * Louisiana 423.svg Louisiana Highway 423
 * MD Route 423.svg Maryland Route 423
 * New Mexico 423.svg New Mexico State Road 423
 * NY-423.svg New York State Route 423
 * OH-423.svg Ohio State Route 423
 * PA-423.svg Pennsylvania Route 423
 * Ellipse sign 423.svg Puerto Rico Highway 423
 * Texas FM 423.svg Farm to Market Road 423