The Pacific Coast Highway in Washington state is technically known as US Route-Highway 101 ... the 101 starts/ends in Olympia/Tumwater area ... from Olympia/Tumwater the 101 travels north along the eastern side of the Olympic National Park, the 101 then turns west and wraps around the northern end of the Olympic National Park, where the 101 then turns south and travels along the Washington coastline to the Washington/Oregon border just south of Long Beach and Cape Disappointment ... see links to WA state PCH cities & attractions below...
http://www.pacificcoasthighwayonline.com/washington/index.html