Duncanville is a city in southern Dallas County, Texas, in the United States. Duncanville's population was 38,524 at the 2010 census. The city is part of the Best Southwest area, which includes Duncanville, Cedar Hill, DeSoto, and Lancaster.
According to the United States Census Bureau, the city has a total area of 11.3 square miles (29 km²), all of it land.
As of the 2010 census Duncanville had a population of 38,524. The racial and ethnic makeup of the population was 32.3% non-Hispanic white, 29.4% non-Hispanic black, 0.7% Native American, 1.7% Asian, 0.1% Pacific Islander, 0.1% non-Hispanic from some other race, 2.5% reporting two or more races and 35.0% Hispanic or Latino of any race.
As of the census of 2000, there were 36,083 people, 12,899 households, and 10,239 families residing in the city. The population density was 3,196.6 people per square mile (1,233.9/km²). There were 13,290 housing units at an average density of 1,177.4 per square mile (454.5/km²). The racial makeup of the city was 63.90% White, 24.76% African American, 0.32% Native American, 1.99% Asian, 0.09% Pacific Islander, 6.83% from other races, and 2.11% from two or more races. Hispanic or Latino of any race were 15.30% of the population.
There were 12,896 households out of which 38.4% had children under the age of 18 living with them, 59.3% were married couples living together, 16.1% had a female householder with no husband present, and 20.6% were non-families. 17.6% of all households were made up of individuals and 5.7% had someone living alone who was 65 years of age or older. The average household size was 2.79 and the average family size was 3.15.
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