Washington (state) Washington (state) Washington (), officially the State of Washington, is a state in the Pacific Northwest region of the United States. Named for George Washington, the first president of the United States, the state was made out of the western part of the Washington Territory, which was ceded by Britain in 1846 in accordance with the Oregon Treaty in the settlement of the Oregon boundary dispute. It was admitted to the Union as the 42nd state in 1889. Olympia is the state capital; the state's largest city is Seattle. Washington is sometimes referred to as Washington State, to distinguish it
Washington State Route 900 In 1913 the highway was renamed the Sunset Highway, which is still an informal moniker today. The road became State Road 2 in 1923 and Primary State Highway 2 in 1937. In 1926 the highway was co-designated to be part of US 10. The legislature in 1931 also designated the route as part of the Washington Loop Highway. The opening of the Lake Washington Floating Bridge across Lake Washington in 1940 moved US 10/PSH 2 to the direct route, and the old alignment became Alternate US 10 and PSH 2 RE (for Renton). In 1955, Alternate US 10 was dropped,