Atoka /ə.ˈtoʊ.kə/ is a town in Tipton County, Tennessee. As an incorporated municipality and as of the 2010 census, Atoka has the second largest population in Tipton County, second only to Covington, the county seat. Between 1990 and 2010, Atoka experienced a huge increase in population. In 1990, the population was 659; by 2010, the population had jumped to 8,387. Atoka's origins, as a municipality in Tennessee, can be traced back to the 1838 charter of Portersville, Tennessee.