Jasper County is the southernmost county in the U.S. state of South Carolina. As of the 2020 census, the population was 28,791. Its county seat is Ridgeland and its largest community is Hardeeville. The county was formed in 1912 from portions of Hampton County and Beaufort County. Jasper County is included in the Hilton Head Island-Bluffton-Port Royal, SC Metropolitan Statistical Area. It is located in the Lowcountry region of the state.