SR 509 | ||||
|---|---|---|---|---|
 | ||||
| Route information | ||||
| Length | 35.17 mi (56.60 km) | |||
| Existed | 1964–present | |||
| Major junctions | ||||
| South end |  I-705 in Tacoma | |||
 SR 99 in Federal Way SR 516 in Des Moines SR 518 in Burien | ||||
| North end | SR 99 in Seattle | |||
| Location | ||||
| Country | United States | |||
| State | Washington | |||
| Counties | Pierce, King | |||
| Highway system | ||||
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State Route 509 (SR 509) is a 35.17-mile-long (56.60 km) state highway in the U.S. state of Washington. The highway goes from Interstate 705 in Tacoma in Pierce County to SR 99 in Seattle in King County.