Washington State Route 339
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| State Route 339 Auxiliary route of |
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| Defined by RCW 47.17.571, maintained by WSDOT | |||||||||||||
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State Route 339 is the only state highway in Washington state to consist only of a Washington State Ferries route; namely, the passenger-only[1] ferry from Vashon Island to downtown Seattle, as designated by RCW 47.17.571.[2]

