Washington County Oregon Cities/Towns - Aloha, Banks, Beaverton, Cornelius, Durham, Forest Grove, Gaston, Hillsboro (County Seat), King City, North Plains, Sherwood, Tigard, Tualatin

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Washington County is one of 36 counties in the U.S. state of Oregon. In 2016 census, its population was 582,779. The seat and largest city is Hillsboro.
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Originally named Twality in 1843, the territorial legislature renamed it for the first president of the United States, George Washington, in 1849.

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