Facts about Washington County, Oregon
Washington County is one of 36 counties in the U.S. state of Oregon. As of the 2010 census, the population was 529,710, making it the state's second most populous county. The county seat and largest city is Hillsboro.
According to the U.S. Census Bureau, the county has a total area of 726 square miles (1,880 km²), of which 724 square miles (1,880 km²) is land and 2.2 square miles (5.7 km²) (0.3%) is water. It is located approximately 20 miles (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 (1,056 m) above sea level in the Northern Oregon Coast Range.
As of the 2010 United States Census, there were 529,710 people, 200,934 households, and 134,323 families residing in the county. The population density was 731.4 inhabitants per square mile (282.4/km²). There were 212,450 housing units at an average density of 293.3 per square mile (113.2/km²). The racial makeup of the county was 76.6% white, 8.6% Asian, 1.8% black or African American, 0.7% American Indian, 0.5% Pacific islander, 7.5% from other races, and 4.3% from two or more races. Those of Hispanic or Latino origin made up 15.7% of the population. In terms of ancestry, 20.8% were German, 12.4% were English, 12.1% were Irish, and 3.2% were American.
Of the 200,934 households, 36.0% had children under the age of 18 living with them, 52.2% were married couples living together, 10.1% had a female householder with no husband present, 33.2% were non-families, and 25.1% of all households were made up of individuals. The average household size was 2.60 and the average family size was 3.14. The median age was 35.3 years.
Serving Washington County, Oregon