Oconomowoc, Wisconsin, United States [City]; population was 10,993 in 1990; housing units was 4,350 in 1990; location is 43°6'N 88°30'W; land area is 5.79 square miles (3,706 acres); water area is 0.49 square miles (316 acres); FIPS code is 59250 [SourceCBP]