South Hampton is a town in Rockingham County, New Hampshire, United States. The population was 894 at the 2020 census. South Hampton is home to Cowden State Forest and Powwow River State Forest. South Hampton was one of the first towns granted by colonial governor Benning Wentworth after the separation of the governorships of New Hampshi…South Hampton is a town in Rockingham County, New Hampshire, United States. The population was 894 at the 2020 census. South Hampton is home to Cowden State Forest and Powwow River State Forest. South Hampton was one of the first towns granted by colonial governor Benning Wentworth after the separation of the governorships of New Hampshire and Massachusetts in 1741. The border between the two colonies was fixed, and consequently South Hampton would be chartered in 1742 from former parts of Amesbury and Salisbury, Massachusetts. Over the years, the town lost territory to Hampton Falls, Seabrook and Newton, but gained territory from East Kingston in 1824. Though it was once part of the larger town of Hampton, it no longer borders its namesake town due to these border changes.