Bluffton is a town in southern Beaufort County, South Carolina, United States. The population as of the 2020 census was 27,716, an increase of over 120% since the 2010 census, making it the 17th-most populous municipality and one of the fastest growing municipalities in South Carolina. It is primarily located around U.S. Route 278, between Hilto…Bluffton is a town in southern Beaufort County, South Carolina, United States. The population as of the 2020 census was 27,716, an increase of over 120% since the 2010 census, making it the 17th-most populous municipality and one of the fastest growing municipalities in South Carolina. It is primarily located around U.S. Route 278, between Hilton Head Island and Interstate 95. The Lowcountry town's original one square mile area, now known as Old Town, is situated on a bluff along the May River. Bluffton is a primary town within the Hilton Head Island-Bluffton-Port Royal, SC Metropolitan Statistical Area.