Washington County, Oregon

Washington County, Oregon
County	Washington County
State	Oregon
Founded year	1843
Seat	Hillsboro
Largest city	Hillsboro
Area total sq mi	727
Area land sq mi	724
Area water sq mi	2.6
Population as of	2020
Population total	600,372
Population density sq mi	829
Time zone	Pacific
District	1st
Named for	George Washington

Washington County, Oregon. Located in the Tualatin Valley of the U.S. state of Oregon, it is a core component of the Portland metropolitan area. The county seat and largest city is Hillsboro, a major center for the Silicon Forest high-tech industry. Established by the Provisional Government of Oregon in 1843, it is one of the original four districts of the Oregon Country and was named for the first President of the United States, George Washington.

History

The area was originally inhabited by the Atfalati band of the Kalapuya people, who established villages along the Tualatin River. Early European American settlement began with the arrival of missionaries and pioneers traveling the Oregon Trail, such as those associated with the Methodist Mission. The county was created by the Provisional Legislature of Oregon in 1843 as the "Tuality District," later renamed in 1849. Significant 19th-century developments included the construction of the Oregon Electric Railway and the growth of agricultural communities like Forest Grove, home to Pacific University, one of the oldest universities in the Western United States. The 20th century saw its transformation from a farming region, known for hops and berries, into a suburban and technological hub, accelerated by the arrival of companies like Intel in the 1970s.

Geography

According to the United States Census Bureau, the county has a total area of 727 square miles, of which 724 square miles is land and 2.6 square miles is water. It is bordered by the Tualatin Mountains (West Hills) to the east, the Chehalem Mountains to the south, and the Northern Oregon Coast Range to the west. Major waterways include the Tualatin River and its tributaries, such as Fanno Creek and Rock Creek. The county contains parts of the Tualatin River National Wildlife Refuge and several regional parks like Tualatin Hills Nature Park. The highest point is Larch Mountain in the Coast Range.

Demographics

As of the 2020 United States census, the population was 600,372, making it the state's second-most populous county after Multnomah County. The racial makeup was diverse, with significant growth in the Asian American and Hispanic or Latino communities. Major cities include Hillsboro, Beaverton, Tigard, and Tualatin. The county is part of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. Historical population growth has been driven largely by the expansion of the high-tech sector, attracting professionals from across the United States and internationally.

Economy

Washington County is the economic engine of the Silicon Forest, hosting the campuses of global technology firms like Intel, Nike (world headquarters in Beaverton), and Genentech. Other major employers include HP Inc., Microsoft, and AWS Elemental. The Oregon Health & Science University has a significant research and healthcare presence in Hillsboro. While technology dominates, legacy agricultural products like wine grapes from the Tualatin Valley AVA and nursery stock remain important. The Washington Square mall is a major retail center, and the county is a focus for biotechnology and clean technology startups.

Government and politics

The county operates under a home rule charter with a Board of County Commissioners chaired by the County Chair. Other elected officials include the Sheriff, District Attorney, and Assessor. It is part of Oregon's 1st congressional district, represented in the U.S. House of Representatives by Suzanne Bonamici. Politically, it has shifted from a historically Republican-leaning area to a competitive Democratic stronghold in recent statewide and national elections, such as those for Governor of Oregon and President of the United States.

Education

Primary and secondary education is provided by several school districts, including the Beaverton School District and Hillsboro School District. The county is also served by Portland Community College's extensive campuses, including the PCC Rock Creek and PCC Willow Creek Center. Higher education institutions include Pacific University in Forest Grove, a private university founded in 1849, and the Oregon Health & Science University's School of Medicine and research facilities in Hillsboro. The Washington County Cooperative Library Services connects public libraries across the region.

Transportation

Major highways include Interstate 5, U.S. Route 26 (the Sunset Highway), and Oregon Route 217. Public transit is managed by TriMet, providing MAX Light Rail service on the Blue and Red lines connecting Hillsboro and Beaverton to Portland. The county is served by the Portland International Airport and has general aviation facilities like the Hillsboro Airport, a major reliever airport. Significant transportation projects have included the expansion of the Southwest Corridor light rail and improvements to the Tualatin Valley Highway.

Category:Washington County, Oregon Category:Oregon counties Category:Portland metropolitan area Category:1843 establishments in Oregon Country