Destrehan, Louisiana, United States [CDP]; population was 8,031 in 1990; housing units was 2,901 in 1990; location is 29°58'N 90°22'W; land area is 6.41 square miles (4,103 acres); water area is 0.84 square miles (538 acres); FIPS code is 20820 [SourceCBP]