Sea Island is a privately owned, unincorporated area of Glynn County, Georgia, and is part of the Golden Isles of Georgia, which include St. Simons Island, Jekyll Island, Little St. Simons Island, and the mainland city of Brunswick. The well-visited seaside resort island is located along the Atlantic Coast just east of St. Simons Island. It lies about 60 miles no…Sea Island is a privately owned, unincorporated area of Glynn County, Georgia, and is part of the Golden Isles of Georgia, which include St. Simons Island, Jekyll Island, Little St. Simons Island, and the mainland city of Brunswick. The well-visited seaside resort island is located along the Atlantic Coast just east of St. Simons Island. It lies about 60 miles north of Jacksonville, Florida, and about 60 miles south of Savannah, Georgia, and is reachable via a causeway from St. Simons Island. The Anschutz family of Denver, Colorado, owns two resorts with limited public access and maintains a gated community for around 500 single-family residences.