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is a city in Dallas County, Texas (USA). Duncanville's population was 36,081 at the 2000 census, and estimated at 42,500 in 2008. Duncanville is a suburb of Dallas and 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 (29.2 km²), all of it land.