Key Biscayne, Florida, United States [CDP]; population was 8,854 in 1990; housing units was 5,724 in 1990; location is 25°41'N 80°10'W; land area is 1.26 square miles (809 acres); water area is 0.12 square miles (74 acres); FIPS code is 36300 [SourceCBP]