Miamisburg, Ohio, United States [City]; population was 17,834 in 1990; housing units was 6,844 in 1990; location is 39°38'N 84°16'W; land area is 9.48 square miles (6,065 acres); water area is 0.19 square miles (121 acres); FIPS code is 49434 [SourceCBP]