Lancaster ( LANG-kis-tər) is a city in Dallas County, Texas, United States. The population was 36,361 at the 2010 census. Founded in 1852 as a frontier post, Lancaster is one of Dallas County's earliest settlements. Today, it is a suburban community located in the Dallas-Fort Worth Metroplex, approximately 15 miles (24 km) south of Downtown Dallas.
Lancaster is part of the Best Southwest area, which includes Lancaster, Cedar Hill, DeSoto, and Duncanville.
In 1841, an act of the Republic of Texas Congress authorized President Mirabeau Lamar to enter into a contract with William S. Peters and nineteen associates to promote settlement in North Texas and paid the company with free land in exchange for recruiting new settlers. Around 600 families would settle in what became known as Peters Colony from 1841 through 1844. The Peters' group advertised heavily in Kentucky, Illinois, Missouri, and Tennessee, and for that reason, many of the earliest settlers were from those states. The first group to settle in the Lancaster area was Roderick Rawlins and his family from Greene County, Illinois. They left for Texas in September 1844. Rawlins and two of his sons-in-law came ahead to select the general area where they would settle.