Washington County, Oregon

Washington County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF WASHINGTON GUS Population: 611,272 (2024) ID: 173624	County	Official County Government	Contact: COMMUNICATIONS OFFICER 155 N 1ST AVE, STE 300, HILLSBORO OR 97124-3072
CITY OF HILLSBORO GUS Population: 110,337 (2024) ID: 211253	Municipal	Municipal Government Within County	Contact: EXECUTIVE ASSISTANT 150 E MAIN ST, HILLSBORO OR 97123-4028
CITY OF BEAVERTON GUS Population: 98,302 (2024) ID: 173706	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 4755, BEAVERTON OR 97076-4755
CITY OF TIGARD GUS Population: 57,301 (2024) ID: 173710	Municipal	Municipal Government Within County	Contact: COMMUNITY DEVELOPMENT DIRECTOR 13125 SW HALL BLVD, TIGARD OR 97223-8144
CITY OF TUALATIN GUS Population: 28,036 (2024) ID: 111622	Municipal	Municipal Government Within County	Contact: CITY MANAGER 18880 SW MARTINAZZI AVE, TUALATIN OR 97062
CITY OF FOREST GROVE GUS Population: 27,076 (2024) ID: 173707	Municipal	Municipal Government Within County	Contact: DIRECTOR OF ADMINISTRATIVE SERVICES PO BOX 326, FOREST GROVE OR 97116-0326
CITY OF SHERWOOD GUS Population: 20,441 (2024) ID: 173708	Municipal	Municipal Government Within County	Contact: ACCOUNTING SUPERVISOR 22560 SW PINE ST, SHERWOOD OR 97140-9933
CITY OF CORNELIUS GUS Population: 15,369 (2024) ID: 111621	Municipal	Municipal Government Within County	Contact: CITY MANAGER 1355 N BARLOW ST, CORNELIUS OR 97113-8912
CITY OF KING CITY GUS Population: 5,002 (2024) ID: 209212	Municipal	Municipal Government Within County	Contact: CITY MANAGER 15300 SW 116TH AVE, KING CITY OR 97224-2693
CITY OF NORTH PLAINS GUS Population: 3,424 (2024) ID: 111623	Municipal	Municipal Government Within County	Contact: CITY RECORDER 31360 NW COMMERCIAL ST, NORTH PLAINS OR 97133-6215
CITY OF DURHAM GUS Population: 1,880 (2024) ID: 173709	Municipal	Municipal Government Within County	Contact: CITY ADMINISTRATOR 17160 SW UPPER BOONES FERRY RD, PORTLAND OR 97224-7004
CITY OF BANKS GUS Population: 1,831 (2024) ID: 202435	Municipal	Municipal Government Within County	Contact: CITY MANAGER 13680 NW MAIN ST, BANKS OR 97106
CITY OF GASTON GUS Population: 676 (2024) ID: 193969	Municipal	Municipal Government Within County	Contact: CITY RECORDER PO BOX 129, GASTON OR 97119-0129