Oklahoma County is a county located in the central part of the U.S. state of Oklahoma. As of the 2010 census, the population was 718,633, making it the most populous county in Oklahoma. The county seat is Oklahoma City, the state capital.

Geography

According to the U.S. Census Bureau, the county has a total area of 718 square miles (1,860 km²), of which 709 square miles (1,840 km²) is land and 9.6 square miles (25 km²) (1.3%) is water.

Demographics

As of the Census of 2010, there were 718,633 people, 277,615 households, and 172,572 families residing in the county. The population density was 1,013 people per square mile (391/km²). There were 319,828 housing units at an average density of 416 per square mile (161/km²). The racial makeup of the county was 64.6% White, 15.4% Black or African American, 3.5% Native American, 3% Asian, 0.1% Pacific Islander, 8.1% from other races, and 5.3% from two or more races. 15.1% of the population were Hispanic or Latino of any race. 12.4% were of German, 12.3% Mexican, 10.1% Irish, 7.9% English, and 7.7% American ancestries according to the Census 2010. 84.4% spoke English and 11.5% Spanish as their first language.

There were 277,615 households out of which 28.5% had children under the age of 18 living with them, 43.1% were married couples living together, 15.4% had a female householder with no husband present, and 37.8% were non-families. 31.9% of all households were made up of individuals and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.26.