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County in Oregon, United States

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. It is bordered on the west and north by the Northern Oregon Coast Range, on the south by the Chehalem Mountains, and on the north and east by the Tualatin Mountains, or West Hills. Major roads include sections of Interstate 5 and 205, the Sunset Highway, Oregon Route 217, 47, 10, 6 and 8. Public transportation is primarily operated by TriMet and includes buses, the Westside Express Service commuter rail, and MAX Light Rail. Other transportation includes air travel at Hillsboro Airport, private airfields and heliports, and heavy rail cargo on rail lines.

The Provisional Legislature of Oregon created the county as Twality District on July 5, 1843. Twality was one of the original four districts of the Provisional Government of Oregon in Oregon Country along with Clackamas, Champooick (later Marion), and Yamhill counties. Columbia, later known as Hillsboro, was selected as the county seat in 1850. Washington County lost significant portions of its original area when Columbia and Multnomah counties were created in 1854. The county area was increased by in 2014 when a section of Multnomah County was attached to Washington. The area was returned to Washington County to allow for property development. The construction of Canyon Road to Beaverton helped Portland to consolidate its position as the primary port of Oregon, and defeat the rival efforts of settlements such as Oregon City and Milwaukie. In November 2004, the County and the City of Beaverton agreed to a plan where the city would annex both unincorporated residential neighborhoods as well as high value areas of land. This would result with Cedar Hills, Garden Home, Raleigh Hills, West Slope being incorporated by 2010, and the communities of Aloha, Bethany, and Cedar Mill at some point after that. Those plans have since been put on hold after Beaverton attempted to annex Nike, Inc.'s World Headquarters, which would have increased Nike's taxes substantially. Nike successfully lobbied the legislature for a law that would prohibit their annexation for 99 years. Since that decision, annexation plans have been halted, and Washington County started urban planning to provide city level services to the unincorporated urban areas in the county.

According to the United States Census Bureau, the county has a total area of 726 square miles (1,880 km2), of which 724 square miles (1,875 km2) is land and 2.2 square miles (6 km2) (0.3%) is water. It is located approximately 20 mile (32 km) to the west of Portland. The Portland Metro Urban Growth Boundary (UGB) bisects the county. The county's highest point is South Saddle Mountain at 3,464 feet (1056 m) above sea level in the Northern Oregon Coast Range. Most of the county is in the Tualatin Valley, formed by the Tualatin Mountains to the east and north, the Chehalem Mountains to the south, and the Northern Oregon Coast Range to the west and north. The Tualatin River, located almost entirely within the county, flows through the Tualatin Plains. The northern and western portions of the county are forested, while the remainder of the county includes urban areas, agricultural lands, and floodplains.

The Tualatin River is the main river in Washington County. Henry Hagg Lake, southwest of Forest Grove, is the largest lake. The Willamette River lies to the east, the Columbia River to the northeast, and the Pacific Ocean to the west of the county.

As of the 2000 census, there were 445,342 people, 169,162 households, and 114,015 families in the county. The population density was There were 178,913 housing units at an average density of The racial makeup of the county was 82.19% White, 1.15% Black or African American, 0.65% Native American, 6.68% Asian, 0.30% Pacific Islander, 5.86% from other races, and 3.17% from two or more races. 11.17% of the population were Hispanic or Latino of any race. 17.2% were of German, 9.9% English, 8.2% Irish, and 6.7% American ancestry. 81.7% spoke only English at home, while 9.6% spoke Spanish and 1.2% Vietnamese. There were 169,162 households, out of which 35.60% had children under the age of 18 living with them, 54.50% were married couples living together, 9.00% had a female householder with no husband present, and 32.60% were non families. 24.70% of all households were made up of individuals, and 6.70% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.14. The county population contained 26.90% under the age of 18, 9.30% from 18 to 24, 34.10% from 25 to 44, 20.90% from 45 to 64, and 8.80% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 99.10 males. For every 100 females age 18 and over, there were 97.00 males. The median income for a household in the county was $52,122, and the median income for a family was $61,499. Males had a median income of $43,304 versus $31,074 for females. The per capita income for the county was $24,969. About 4.90% of families and 7.40% of the population were below the poverty line, including 8.30% of those under age 18 and 5.30% of those age 65 or over.

The county is governed by an elected board of five commissioners. The county is divided into four commissioner districts. One commissioner sits for each district, and the fifth commissioner is at large and is the chair of the board.

+ Previous gubernatorial election results Year Democratic Republican Third parties202255.08% 140,94635.59% 91,0689.33% 23,868201855.49% 137,88639.15% 97,2865.36% 13,307201451.45% 98,20342.69% 81,4845.57% 10,600201049.62% 92,81148.08% 89,9262.30% 4,296200659.09% 51,19538.98% 33,7771.93% 1,674200264.92% 60,09534.40% 31,8440.68% 633199866.83% 50,32533.14% 24,9560.03% 23 199457.68% 45,26142.32% 33,2100.00% 1

Washington County is centered on a fertile plain that attracted farmers before the first wagon trains. In 1997, orchards covered of the county's lands and were devoted to vineyards. Agriculture is still a major industry in Washington County, as are lumber, manufacturing, and food processing. The development of a large electronics industry during the 1980s and 1990s is the dominating factor of the county economy, and contributing to the creation of Oregon's Silicon Forest. California based Intel, Oregon's largest private sector employer, has its largest concentration of employees in the county, mainly in Hillsboro. Other technology companies include Electro Scientific Industries, FEI Company, Qorvo, Tektronix, SolarWorld, Planar Systems, and EPSON. Nike, one of two Fortune 500 corporations based in Oregon, has its headquarters in Washington County. Until it was acquired by IBM, Sequent Computer Systems was headquartered near Nike. Other companies with headquarters in Washington County include optical instruments manufacturer Leupold & Stevens, Columbia Sportswear, and Reser's Fine Foods.

Helvetia is a small unincorporated community in Washington County, Oregon. It is located in the Tualatin Valley along U. S. Route 26, 15 minutes west of Portland. It was named by Swiss immigrants to Oregon in the 19th century. The reality television series Little People, Big World is set on Roloff Farms in Helvetia, making the location a popular tourist attraction. The Helvetia area is only a few miles from both the Intel and Nike headquarters campuses. It consists of heritage farms and million dollar estate properties. The area is part of Tualatin Valley Fire and Rescue's service area. The Holcomb Creek Trestle, the longest wooden railroad bridge currently in use in the United States, is located in the Helvetia area.