Jeffersontown, Kentucky, United States [City]; population was 23,221 in 1990; housing units was 9,369 in 1990; location is 38°12'N 85°34'W; land area is 9.67 square miles (6,190 acres); water area is 0.01 square miles (4 acres); FIPS code is 40222 [SourceCBP]