McAlester is a city in and the county seat of Pittsburg County, Oklahoma. As of the 2020 census, McAlester had a population of 18,171. The town gets its name from James Jackson "J. J." McAlester, an early settler and businessman who later became lieutenant governor of Oklahoma. McAlester married Rebecca Burney, the daughter of a full-blood Chickasaw family, which made him a citizen of the Chickasaw Nation.