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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.
Centrally located in Stephens County, Duncan became the county seat after Oklahoma achieved statehood in 1907. As a compromise between residents of the northern and southern parts of the county, the county courthouse was located in the middle of Duncan's Main Street, half of it in the northern part of the city and county and half in the southern.