State Route 8 (SR 8) is a state highway in Grays Harbor and Thurston counties, of the U.S. state of Washington. It extends 20.67 miles (33.27 km) from...

Since the 1964 state highway renumbering, which established the current state route system, the Washington State Department of Transportation has decommissioned...

pass through the state, maintained by the Washington State Department of Transportation (WSDOT). The system spans 8.5% of the state's public road mileage...

State Route 900 (SR 900) is a state highway serving part of King County, Washington, United States. It travels 16 miles (26 km) between southern Seattle...

State Route 20 (SR 20), also known as the North Cascades Highway, is a state highway that traverses the U.S. state of Washington. It is the state's longest...

State Route 99 (SR 99), also known as the Pacific Highway, is a state highway in the Seattle metropolitan area, part of the U.S. state of Washington. It...

State Route 522 (SR 522) is a state highway in the U.S. state of Washington that serves the Seattle metropolitan area. Approximately 25 miles (40 km)...

State Route 410 (SR 410, partially named the Chinook Scenic Byway, and also named the Stephen Mather Memorial Parkway) is a 107.44-mile (172.91 km) long...

State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 13 miles (21 km)...

system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR). It was created in 1964 to replace...