SR 507 begins at I-5 Exit 81 in Centralia and heads NNE via Bucoda to Tenino, then NE via Rainier, Yelm, McKenna, and Roy to Jct SR 7 in Spanaway. SR 507 is 43.52 miles long.
Before 1964, SR 507 from Centralia to Tenino had been SSH 1N and from Tenino to Spanaway, SSH 5H.
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