Washington State Route 519
State highway in King County, Washington, US
SR 519 in the state of Washington is unique in that it marks the furthest west boundary for US Interstate 90 (I-90). 4th Avenue south in the city of Seattle is the entry to I-90, heading east which ends in Boston, MA.
This trip (I-90) puts you on the 3rd longest road in the United States covering 3,101.77 miles. Only US Route 20 and US Route 6 are longer.
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