Washington County, Oregon Genealogy
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Washington county was renamed from Twality County 3 September 1849. Named for George Washington, the first president of the United States.
The county seat is Hillsboro.
County Records Inventory listing the records held at the Washington County Court House as of October 2005.
Unincorporated Communities: Banks | Beaverton | Cornelius | Durham | Forest Grove | Gaston | Hillsboro | King City | Lake Oswego | Portland | North Plains