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I'm Jan Bony, current coordinator for Washington County. If you have additions, corrections, bad links, links to add please use the Contact page to reach me.

Washington County Libraries

Forest Grove City Library
2114 Pacific Ave, Forest Grove · (503) 992-3247

Hillsboro Public Library
2850 Ne Brookwood Pkwy, Hillsboro · (503) 615-6500

Shute Park Branch Library
775 Se 10th Ave, Hillsboro · (503) 615-6500

Washington Co. Ccoperative Library Services

Historical Societies & Genealogical Societies

Genealogical Society of Washington Co, OR
Mailing Address:
PO BOX 2123

Meeting Location:
Hillsboro Public Library
2850 Northeast Brookwood Parkway
Hillsboro, OR


Washington County Museum
Research Library, Museum Collections and Archives -
by appointment – call 503.645.5353
Portland Community College – Rock Creek Campus
17677 NW Springville Road
Portland, OR 97229
Click here for map.


Washington County is one of 36 counties in the U.S. state of Oregon. As of the 2010 census, the population was 529,710,[1] making it the second most populous county in the state.[2] The seat and largest city is Hillsboro.[2][3] Other cities include Beaverton, Tigard, and Forest Grove, the oldest city in the county.[4] nally named Twality when created in 1843, the territorial legislature renamed it for the first president of the United States, George Washington, in 1849. The original boundaries included the entire northwest corner of Oregon before sections became new counties. The Tualatin River and its drainage basin are almost entirely within the county, with the county nearly coterminous 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).

Major roads in the county include small sections of Interstate 5 and Interstate 205, the Sunset Highway, Oregon Route 217, Oregon Route 47, Oregon Route 10, Oregon Route 6, and Oregon Route 8. Public transportation is primarily operated by TriMet and includes buses, the Westside Express Service commuter rail, and MAX Light Rail. Other transportation includes air travel at the Hillsboro Airport, several private airfields and heliports, and heavy rail cargo on several rail lines.