St. Simons is a census-designated place (CDP) located on St. Simons Island in Glynn County, Georgia, United States. Both the community and the island are commonly considered to be one location, known simply as "St. Simons Island", or locally as "The Island". St. Simons is part of the Brunswick, Georgia Metropolitan Statistical Area, and according to the 2000 census, the CDP had a population of 13,381.St.