List of state routes in Washington
Marker for SR 9, SR 20, and SR 410
Map of Washington's highways
|Interstates:||Interstate X (I-X)|
|US Highways:||U.S. Route X (US X)|
|State:||State Route X (SR x)|
This is a list of state routes in the U.S. state of Washington that have existed since the 1964 renumbering. It includes routes that were defined by the Washington State Legislature but never built, as well as routes that have been entirely removed from the state highway system.
- If a route was renumbered, the old or new number is given in the "formed" or "eliminated" column.
- The years are when legislative action was taken, not when real-world changes were made.
- Former termini are not shown if they are along the current route, meaning that the route was simply extended.
- "State Highway Log" (PDF). Washington State Department of Transportation. 2006. Archived from the original (PDF) on March 26, 2009. Retrieved May 5, 2013.
- Lengths rounded to the nearest mile or tenth-mile are estimated from various sources including Google Maps.
- This refers to when the law adding the roadway to the state highway system was passed.
- "State Highway Log" (PDF). Washington State Department of Transportation. 2004. Archived from the original (PDF) on April 10, 2008. Retrieved May 5, 2013.