Washington County is one of 36 counties in the U.S. state of Oregon and part of the Portland metropolitan area. The 2020 census recorded the population as 600,372, making it the second most populous county in the state and most populous "Washington County" in the United States. Hillsboro is the county seat and largest city, while other major cities include Beaverton, Tigard, Cornelius, Banks, Gaston, Sherwood, North Plains, and Forest Grove, the county's oldest city. Originally named Twality when created in 1843, the Oregon Territorial Legislature renamed it for the nation's first president in 1849 and included the entire northwest corner of Oregon before new counties were created in 1854. The Tualatin River and its drainage basin lie almost entirely within the county, which shares its boundaries with the Tualatin Valley.

Founded: July 5, 1843 (as Twality District)
Named for: George Washington
Seat: Hillsboro
Largest city: Hillsboro
Total: 726 sq mi (1,880.33 km²)
Land: 724 sq mi (1,875.15 km²)
Water: 2.2 sq mi (5.7 km²), 0.3
Density: auto/sq mi (/km²)
Time zone: Pacific: UTC-8-7
Website: [www.washingtoncountyor.gov/]
Twitter profile: WashcoOregon
Facebook profile: WashCoOregon
Official Website: http://www.co.washington.or.us
Wikidata description: county in Oregon, United States
Wikidata id: Q484538
Wikidata label: Washington County
Wikidata aliases: Array
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