Maquoketa, Iowa, United States [City]; population was 6,111 in 1990; housing units was 2,724 in 1990; location is 42°4'N 90°40'W; land area is 3.36 square miles (2,150 acres); water area is 0.03 square miles (19 acres); FIPS code is 49215 [SourceCBP]