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From Wikipedia, the free encyclopedia. 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. 1 Geography.
The city of Duncanville is located in Dallas County. The 2010 Census gave Dallas County a population of 2,368,139 people. This means that Duncanville had 1.63% of the county's total population, making it Dallas' 12th most populous community. At the same time, Texas had a population of 25,145,561 people, meaning that Duncanville had 0.15% of the total population of Texas - making it the state's 74th most populous community.