Washington County, Oregon Genealogy

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Revision as of 19:13, 3 May 2013

United States Gotoarrow.png Oregon Gotoarrow.png Washington County

Guide to Washington County Oregon genealogy. Birth records, marriage records, death records, census records, family history, and military records.

Hand and keyboard.jpg Oregon
Online Records

Washington County, Oregon
Map of Oregon highlighting Washington County
Location in the state of Oregon
Map of the U.S. highlighting Oregon
Location of Oregon in the U.S.
Founded September 3, 1849
County Seat Hillsboro
Address Washington County Courthouse
155 N 1st Avenue Ste 130
Hillsboro, OR 97124-3072
Phone: 503.864.8741
Washington County Website


County Courthouse

Record Section, Assessment & Taxation has marriage,
land and military records from 1850.
Clerk Circuit Court has divorce and court records
from 1896, probate records from 1871 and
naturalization records from 1906. [1]

  • 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. [2]

Boundary Changes

16 January 1854: Columbia County set off.

22 December 1854: Multnomah County set off.

Places / Localities

Populated Places

Please do not format these pages unless you have contents to add to them.

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

Please do not format these pages unless you have contents to add to them.

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

The Family History Library has copies of some records such as:

Washington County coroner's inquest records 1854-1889

Societies, Libraries and Museums

Family History Centers


Washington County Oregon Genealogy References

  1. Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), Washington County, Oregon page 574, At various libraries (WorldCat); FHL Book 973 D27e 2002.
  2. WorldCat 50140092FHLC Handybook for Genealogists: United States of America, 10th ed.] (Draper, Utah: Everton Pub., 2002)