Oak Island is a seaside town located in the southeastern corner of North Carolina, United States. Part of Brunswick County, the major portion of the town is on Oak Island which it shares with Caswell Beach. Founded in 1999 as the result of the consolidation of two existing towns, Oak Island's main industry is tourism. Per the 2020 census, the town has a permanent population of 8,396 while its summer population is near 50,000.