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How many interstate highway systems does Washington state have and list them?


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March 05, 2015 3:51AM

There is seven roads that are part of the system, three primary routes and four auxiliary routes, the highways connect every city in the state with a population of over 100,000(Seattle, Spokane, Tacoma, Vancouver, Bellevue, and Everett) as well as the state capital, Olympia.