what county is duncanville texas
Duncanville, TX. Duncanville 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. Duncanville is located at 32Â°38â²47â³N 96Â°54â²41â³W / 32.64639Â°N 96.91139Â°W / 32.64639; -96.91139 (32.646333, -96.911309).