Wentzville, Missouri, United States [City]; population was 5,088 in 1990; housing units was 1,914 in 1990; location is 38°49'N 90°52'W; land area is 9.67 square miles (6,190 acres); water area is 0.01 square miles (4 acres); FIPS code is 78442 [SourceCBP]