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is a city in Dallas County, Texas (USA). As of the 2000 U.S. Census, the city population was 25,894 (though a 2007 estimate placed the city's population at 35,050).
Lancaster is a suburb of Dallas and is part of the Best Southwest area, which includes Lancaster, Cedar Hill, DeSoto, and Duncanville.
According to the United States Census Bureau, the city has a total area of 29.3 square miles (75.9 km²), of which, 29.3 square miles (75.9 km²) of it is land and 0.03% is water.