SR 203 begins at Jct SR 202 across the Snoqualmie River north of Fall City and heads north along the east side of the Snoqualmie Valley via Carnation and Duvall to Jct US 2 at Monroe. SR 203 is 24.26 miles long.
Before 1964, SR 203 had been SSH 15B.
Interstate Routes
US Routes
State Routes
Primary State Hwys
Secondary State Hwys
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