Washington County is one of 36 counties in the U.S. state of Oregon and part of the Portland metropolitan area. The 2020 census recorded the population as 600,372,[1] making it the second most populous county in the state and most populous "Washington County" in the United States. Hillsboro is the county seat and largest city,[2][3] while other major cities include Beaverton, Tigard, Cornelius, Banks, Gaston, Sherwood, North Plains, and Forest Grove, the county's oldest city.[4] Originally named Twality when created in 1843, the Oregon Territorial Legislature renamed it for the nation's first president in 1849 and included the entire northwest corner of Oregon before new counties were created in 1854. The Tualatin River and its drainage basin lie almost entirely within the county, which shares its boundaries with the Tualatin Valley. It is bordered on the west and north by the Northern Oregon Coast Range, on the south by the Chehalem Mountains, and on the north and east by the Tualatin Mountains, or West Hills.

Maps
Oregon Base Map ~ Oregon Territory Map 1852 [Oregon History Project]
David Rumsey ~ Historic Map & Atlas Collection Perry-Castaneda: Map Collection
Interactive Earthquake Fault Map
  MapGoose
American Georgaphical Society Library - Digital Map Collection
Humboldt State University Map Collection
Sanborn Fire Insurance Maps for Oregon~ Railroad Maps
Satelitte Weather Map
And, of course, Google Earth

Trails West & Mining History
Overland Trail ~ Oregon Trail ~ Deaths along the Oregon Trail: 1852
Oregon Historical Mining ~ Oregon: Mining Claim Maps
'Ghost Towns in Oregon' ~ The Volcano's of Oregon
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Biographies, Books, Oregon Pioneers

"What's New"
History Of The
Pacific Northwest:
Oregon And Washington

Embracing An Account Of The Original Discoveries On The Pacific Coast Of
North America, And A Description Of The Conquest, Settlement And
Subjugation Of The Vast Country Included In The Original Territory Of Oregon

Also Interesting Biographies Of The Earliest Settlers And
More Prominent Men and Women of the Pacific Northwest
Volume II, 1889

Compiled And Published By The
North Pacific History Company
Of Portland, Oregon
The Biographies have been split to Alpha Sections
The Files are large, but can be downloaded: Please use this link
Please use this link for the Index

There are Historical Paragraphs about several OR Counties:
Here is the Paragraph for Washington County


"Appleton's Cyclopaedia of American Biography "
by Wilson, James Grant, 1832-1914; Fiske, John, 1842-1901
Publication date 1900 
Appleton Review ~ Archive.org [All Volumes]

New Oregon Resources / FS Catalog
Filmed Books: 1000368



There does not seem to be a definitive history of Washington County
in the nice old County Histories written from 1875 - 1925,
but I will see if I can find Biographies in other books.
There are Washington County Bios in the USGW Archives

"The Centennial History of Oregon 1811 - 1912"
Volume's II. III, IV
The S J Clark Publishing Company, Chicago, 1912

"An Illustrated History of the State of Oregon"
H. K. Hines, Author Published by Lewis Pub. Co., Chicago, 1893
The Book is in the Google Book Archives / Bio Index with Links

"1867 Pacific Coast Directory"
Merchant Listings for: Clackamas, Tillamook & Washington Counties, OR

"Portrait and Biographical
Record of Portland and Vicinity, Oregon"
Chapman Publishing Company, Chicago: 1903
The Index is Here ~ Read Online or Download

"History of the Great Northwest and it's Men of Progress"
Pub: The Minneapolis Journal - The Index is Here
Read Online or Download
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Oregon Pioneers & Donation Claims
I found a batch of filmed records for Oregon Pioneers.
These seem to be for Washington County.
Vol 1, Index: Images 6 - 63 / Vol 1, Registers: Images 69 - 240
Vol 2, Index: Images 247 - 280 / Vol 2, Registers: Images 281 - 364
Vol 3, Index: Images 371 - 377 / Vol 3, Registers: Images 378 - 492
These can be found here, Film # 857038 [Sign in for access]

Donation Claims : Index
FS has the Volumes and they can be downloaded.
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Family Search "Collections"
There is a wealth of Family and Historical information contained on the FamilySearch WebSite.
It can be overwhelming to figure out where to start.
So, I have created concentrated categories of databases which are accessible via linked pdf files.

Cemeteries, Etc [Burial, Cemeteries, Coroner, Funeral Homes, Graves]
Church Records[ Baptism's, Catholic Church, Christenings, Church [General]]
Legal Documents and Resources [Court, Estate, Probate Records]
Migration - Naturalization - Travel[ Border Crossings, Migration, Naturalization, Passenger Lists, Passports]
Military [Bounty [Land], Military [Misc], Pensions, Soldiers, Veteran's, War[s]]
Odds and Ends [Applications, Homestead, Membership, Native Americans, Parish [Location & Church], Pioneers, Prison, Voting, Obituaries, Veteran & Soldier's Homes, Children's Home]
Vital Records [Birth, Marriage, Divorce, Death, Mortality Records]
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Lookups and Queries
If you wish to post Genealogical or Historical Queries online,
try looking at Cyndi's List for specific mail lists.

Lookups: Archival Newspapers: Subscription Sites
I have access to the following Databases [Library Editions]:
Heritage Hub ~ My Heritage
Lookups: Contact Martha