List of U.S. Routes in Washington
The U.S. Routes in Washington are segments of the United States Numbered Highway System that are owned and maintained by the U.S. state of Washington through the Washington State Department of Transportation (WSDOT). The United States Numbered Highway System in Washington covers 1,390.63 miles (2,238.0 km) and consists of eight highways, divided into four primary routes and four auxiliary routes.
| U.S. Routes in Washington | |
|---|---|
Highway markers in different years for former U.S. Route 10 (1926), former U.S. Route 99 (1961), and current U.S. Route 101 (1970) | |
The state highway system of Washington, with U.S. routes highlighted in red. | |
| System information | |
| Length | 1,390.63 mi (2,238.00 km) |
| Formed | November 11, 1926 |
| Notes | Maintained by WSDOT |
| Highway names | |
| US Highways | U.S. Route nn (US nn) |
| Alternate Routes: | U.S. Route nn Alternate (US nn Alt) |
| Spur Routes: | U.S. Route nn Spur (US nn Spur) |
| System links | |
The United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and included eleven routes traveling through Washington.
In 1961, the state introduced a set of route markers in Olympia that were colored based on destination and direction rather than route.
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