Atoka is a city in and the county seat of Atoka County, Oklahoma, United States. The population was 3,195 as of the 2020 Census, a 2.4% increase over the 3,107 reported at the 2010 census, which was itself an increase of 4.0 percent from the figure of 2,988 in 2000. 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.