Seabrook Island Charleston CountySouth Carolina www.townofseabrookisland.org Map Population 1,880 (2020)Type TownArea 5.94 sq mi (15.38 km²), 1.12 sq mi waterGovernment TOWN OF SEABROOK ISLANDGovernment office 2001 SEABROOK ISLAND RD, JOHNS ISLAND, SC 29455