County Seat: 155 N 1st Ave., Suite 300, Hillsboro 97124
Phone: 503-846-8611 (General); 503-846-8888 (Court Administrator)
Population (2013): 550,990
Established: July 5, 1843
Elev. at Hillsboro: 196'
Area: 727 sq. mi.
Average Temp.: January 39.9° July 66.6°
Assessed Value: $53,515,861,950
Real Market Value: $71,453,357,743
Annual Precipitation: 37.71"
Economy: Agriculture, horticulture, forest products, food processing, high tech, sports equipment and apparel
Historical Records Inventory
"County QuickFacts" (population and economic data from U.S. Census Bureau)
County Seat Map (from Yahoo! Maps)
County Map (from ODOT)
Points of interest
Tualatin Valley orchards and vineyards, Pacific University, Wilson River and Sunset Highways, Hagg Lake, Old Scotch Church
History and general information
The original four counties created by the Provisional Government of Oregon were: Twality, Clackamas, Yamhill and Champoick. Twality was changed to Washington in honor of President George Washington by the Territorial Legislature on September 3, 1849. The actual organization of Washington County government followed several years later.
Now one of the state’s fastest developing areas, the fertile Tualatin Valley was once filled with beaver and was a favorite hunting ground for Hudson’s Bay Company trappers. The first white settlers arrived around 1840, lured by rich soil. Despite its rapid urbanization, the valley still contains prime agricultural land. Many small towns rich in history dot the area. Pacific University, founded as Tualatin Academy in 1849, is one of the oldest colleges in the West. Washington County operates under a home rule charter approved by voters in 1962. The Northwest’s largest enclosed shopping center, Washington Square, is located south of Beaverton.
Commissioners—Andy Duyck, Chair 2019, Greg Malinowski 2019, Roy Rogers 2017, Dick Schouten 2017, Bob Terry 2019; Dist. Atty. Robert Hermann 2019; Justice of the Peace James Shartel 2021; Sheriff Pat Garrett 2017; Auditor John Hutzler 2019; Assess./Clerk Richard Hobernicht; Surv. James Elam; Co. Admin. Robert Davis; Chief Info. Officer Phillip Bransford