St. Simons, Georgia, United States [CDP]; population was 12,026 in 1990; housing units was 6,764 in 1990; location is 31°11'N 81°23'W; land area is 16.61 square miles (10,631 acres); water area is 1.25 square miles (801 acres); FIPS code is 68068 [SourceCBP]