Dallas County is a county in the U.S. state of Texas. As of the 2010 census, the population was 2,368,139. It is Texas' second-most populous county and the ninth-most populous in the United States. Its county seat is Dallas, which is also Texas' third-largest city and the ninth-largest city in the United States. The county was founded in 1846 and was possibly named for George Mifflin Dallas, the 11th Vice President of the United States under U.S. President James K. Polk.
Dallas County is included in the Dallas–Fort Worth–Arlington, TX Metropolitan Statistical Area (colloquially referred to as the Dallas-Fort Worth Metroplex).
According to the U.S. Census Bureau, the county has a total area of 909 square miles (2,350 km²), of which 873 square miles (2,260 km²) is land and 36 square miles (93 km²) (4.0%) is water.
As of the census of 2010, there were 2,368,139 people, 807,621 households, and 533,837 families residing in the county. The population density was 2,523 people per square mile (974/km²). There were 854,119 housing units at an average density of 971/sq mi (375/km²). The racial makeup of the county was 53.54 White (33.12% Non-Hispanic White), 22.30% Black or African American, 0.10% Native American, 5.15% Asian, 0.06% Pacific Islander, 14.04% from other races, and 2.70% from two or more races. 38.30% of the population were Hispanic or Latino of any race.
There were 807,621 households out of which 35.10% had children under the age of 18 living with them, 46.90% were married couples living together, 14.10% had a female householder with no husband present, and 33.90% were non-families. 27.30% of all households were made up of individuals and 5.90% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.34. As of the 2010 census, there were about 8.8 same-sex couples per 1,000 households in the county.
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