County Seat: 155 N 1st Ave., Suite 300, Hillsboro 97124
Phone: 503-846-8611 (General); 503-846-8888 (Court Administrator)
Population (2011): 536,370
Established: July 5, 1843
Elev. at Hillsboro: 196'
Area: 727 sq. mi.
Average Temp.: January 39.9° July 66.6°
Assessed Value: $49,355,659,075
Real Market Value: $67,614,912,187
Annual Precipitation: 37.71"
Economy: Agriculture, horticulture, forest products, food processing, high tech, sports equipment and apparel
Historical Records Inventory
Economic Information (from OBDD)
"County Quick Facts" (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 2015, Greg Malinowski 2015, Roy Rogers 2017, Dick Schouten 2017, Bob Terry 2015; Dist. Atty. Robert Hermann 2015; Assess./Clerk Richard Hobernicht; Justice of the Peace James Shartel 2015; Sheriff Pat Garrett 2017; Surv. James Elam; Auditor John Hutzler, 2015; Co. Admin. Robert Davis; Chief Info. Officer Phillip Bransford