State Route 8 begins at Jct US 12 at Elma and heads east via McCleary to Jct US 101 at Mud Bay, a half dozen miles west of downtown Olympia. SR 8 is 20.67 miles long.
When the current state highway numbering system was first posted in January 1964, SR 8 began at Jct US 410 at Elma and headed southeasterly via Oakville and Rochester to Jct I-5/US 99 at Grand Mound. In 1967, US 12 was extended into Washington State. SR 8 from Elma to Grand Mound became part of US 12 and the portion of US 410 from Elma to Mud Bay became SR 8.
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