Washington County, Oregon GenealogyEdit This Page

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United States > Oregon > Washington County


County Courthouse


155 N. First Avenue, Suite 300
Hillsboro, OR 97124
(503) 846-8685

  • Records Held at the Courthouse

County Records Inventory listing the records held at the Washington County Court House as of October 2005.

  • Record Loss:

Quick Facts


3 September 1849: Washington county was renamed from Twality County.

Named for George Washington, the first president of the United States.

Boundary Changes

16 January 1854: Columbia County set off. 22 December 1854: Multnomah County set off.

Places / Localities

Populated Places


Banks | Beaverton | Cornelius | Durham | Forest Grove | Gaston | Hillsboro | King City | Lake Oswego | North Plains | Portland | Rivergrove | Sherwood | Tigard | Tualatin | Wilsonville


Neighboring Counties

Clackamas | Clatsop | Columbia | Multnomah | Tillamook | Yamhill



  • 1845 Territorial Transcription and Index (under name of Tuality, Twalatain and Twality County)
  • 1849 Territorial Transcription and Index (under name of Twality County)
  • 1850 Territorial Transcription and Index
  • 1853 Territorial Transcription and Index
  • 1856 Territorial Transcription and Index

Genealogy Websites

The Washington County GenWeb Project, part of The ORGenWeb Project, a state project affiliated with The USGenWeb Project.


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