Estero, Florida, United States [CDP]; population was 3,177 in 1990; housing units was 3,314 in 1990; location is 26°26'N 81°49'W; land area is 6.14 square miles (3,929 acres); water area is 0.02 square miles (13 acres); FIPS code is 21150 [SourceCBP]