 DeWitt, centrally located in Arkansas County, is the southern district county seat and second-largest city in the county with a population of 3,292 in 2010.The remaining communities each have populations under 750 as of 2010; Humphrey is partially located in Jefferson County on Arkansas County's western edge, St. Charles is on the White River in the eastern portion of the county, and Gillett in southern Arkansas County.Almyra is located along Highway 130 between DeWitt and Stuttgart.