Washington State Route 509
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SR 509 is highlighted in red.
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| Route information | ||||
| Auxiliary route of I‑5 | ||||
| Defined by RCW 47.17.680 | ||||
| Maintained by WSDOT | ||||
| Length: | 35.17 mi (56.60 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
 I‑705 in Tacoma
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 SR 99 in Federal Way SR 516 in Des Moines SR 518 in Burien
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| North end: |
SR 99 in Seattle
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| Location | ||||
| 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, connecting Tacoma in Pierce County to Seattle in King County. The highway travels north from Interstate 705 (I-705) in Tacoma to SR 99 south of downtown Seattle. It serves cities along the Puget Sound and west of Seattle–Tacoma International Airport in south King County, including Federal Way, Des Moines, and Burien. SR 509 is part of the National Highway System and is a limited-access highway near the Port of Tacoma and from Burien to its northern terminus in Seattle. Prior to the 1964 highway renumbering, the highway was part of Secondary State Highway 1V (SSH 1V) from Tacoma to Des Moines and SSH 1K from Des Moines to Seattle. SR 509 was re-aligned onto the Burien Freeway in 1968 and the Port of Tacoma bypass in 1997, coinciding with the opening of its interchange with I-705 and the cable-stayed 21st Street Bridge. Various proposals since 1988 have recommended building a freeway extension of SR 509 within the city of SeaTac, connecting the Burien Freeway to I-5, that remains unbuilt.
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