What is Washington State Route 519?
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|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. [[Category:Roads in Washington (state)]] {{US-stub}}