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Washington County

Originally named Twality when created on July 5, 1843, it was renamed by the Oregon Territorial Legislature in 1849 after George Washington, the nation's first president. At that time, it included the entire northwest corner of Oregon.  In 1854, the new counties of Columbia and Multnomah were created and the size of Washington County decreased dramatically. In 2014, sections of Mulnomah County were reattached to Washington county.

Columbia, later known as Hillsboro, was selected as the county seat in 1850.

The 2020 census showed Washington County as being the 2nd most populous county in the state.



Pacific Avenue in Forest Grove, c. 1920

Cities

Banks * Beaverton * Cornelius * Durham * Forest Grove * Gaston * Hillsboro *
King City * North Plains * Sherwood * Tigard * Wilsonville

Lake Oswego [Small portion, mostly in Clackamas County]
Portland [Small portion, mostly in Multnomah County]
Rivergrove [Small portion, mostly in Clackamas County]
Tualatin [Small portion - also in Clackamas County]

Census-designated places
Aloha * Bethany * Bull Mountain * Cedar Hills * Cedar Mill * Cherry Grove * Dilley * Garden Home-Whitford *
Marlene Village * Metzger * Oak Hills * Raleigh Hills * Rockcreek * West Haven-Sylvan * West Slope

Unincorporated Communities
Bacona * Balm Grove * Blooming * Bonita * Bonny Slope * Bradley Corner * Buckheaven * Buxton * Carnation * Chehalem *
Dixie * Elmonica * Farmington * Gales Creek * Glencoe * Glenwood * Hayward * Hazeldale * Helvetia * Hillside * Huber *
Kansas City * Kinton * Laurel * Laurelwood * Manning * Middleton * Midway * Mountaindale * Mulloy * Norwood * Orenco *
Patton * Progress * Reedville * Roy * Scholls * Six Corners * Somerset West * Tanasbourne * Thatcher * Timber * Tobias *
Verboort * Watts * West Union * Wilkesboro * Witch Hazel