Ater, TexasAter is an unincorporated community in Coryell County, in the U.S. state of Texas. According to the Handbook of Texas, the community had a population of 25 in 2000. It is located within the Killeen-Temple-Fort Hood metropolitan area.GeographyAter is located a mile north of Farm to [Market Road 2412] on the Leon River's south bank, northwest of Gatesville in northwestern Coryell County.EducationAter has been a part of the Jonesboro [Independent School District] since 1939.