Marion County is a county located in the U.S. state of Oregon. The population was 315,335 at the 2010 census, making it the fifth-most populous county in Oregon. The county seat is Salem, the state capital. The county was originally named the Champooick District, after Champoeg (earlier Champooick), a meeting place on the Willamette River. On September 3, 1849, the territorial legislature renamed it in honor of Francis Marion, a Continental Army general from South Carolina who served in the American Revolutionary War.
According to the U.S. Census Bureau, the county has a total area of 1,193 square miles (3,090 km²), of which 1,182 square miles (3,060 km²) is land and 10 square miles (26 km²) (0.9%) is water.
As of the 2010 United States Census, there were 315,335 people, 112,957 households, and 77,044 families residing in the county. The population density was 266.7 inhabitants per square mile (103.0/km²). There were 120,948 housing units at an average density of 102.3 per square mile (39.5/km²). The racial makeup of the county was 78.2% white, 1.9% Asian, 1.6% American Indian, 1.1% black or African American, 0.7% Pacific islander, 12.6% from other races, and 3.9% from two or more races. Those of Hispanic or Latino origin made up 24.3% of the population. In terms of ancestry, 22.1% were German, 11.4% were English, 11.0% were Irish, and 4.7% were American.
Of the 112,957 households, 35.5% had children under the age of 18 living with them, 50.4% were married couples living together, 12.4% had a female householder with no husband present, 31.8% were non-families, and 25.0% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.23. The median age was 35.1 years.
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