Atoka is a city in, and the county seat of, Atoka County, Oklahoma, United States. The population was 3,107 at the 2010 census, an increase of 4.0 percent from 2,988 at the 2000 census.The city was settled by the Choctaw and named in 1867 by a Baptist missionary for Chief Atoka, whose name means "ball ground" in English.