Washington County, Oregon GenealogyEdit This Page

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United States Gotoarrow.png Oregon Gotoarrow.png 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

Wikipedia has more about this subject: Washington County, Oregon

3 September 1849: Washington county was renamed from Twality County. Named for George Washington, the first president of the United States. [1]

Boundary Changes

16 January 1854: Columbia County set off.

22 December 1854: Multnomah County set off.

Places / Localities

Populated Places

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

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Neighboring Counties

Clackamas | Clatsop | Columbia | Multnomah | Tillamook | Yamhill

Trivia Tidbits

Information about localities, too small or too brief to describe in separate pages. Exception to this are Post Offices. > Trivia Tidbits


Archives and Libraries


Cemeteries (Rural)

For cemeteries very nar or within the cities or communities, please see these places.


  • 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

Church History and Records

Court Records



Land and Property


Military History and Records


Probate Records

Rivers and Waterways

Details about the rivers and waterways where farms and settlements are often found along them. >> Rivers and Waterways

School Records


Vital Records

Societies, Libraries and Museums



  1. WorldCat 50140092FHLC Handybook for Genealogists: United States of America, 10th ed.] (Draper, Utah: Everton Pub., 2002)


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