 For every 100 females age 18 and over, there were 99.7 males.There were 23,316 housing units at an average density of 1,473.0 per square mile (568.7/km²), of which 9,375 (43.3%) were owner-occupied, and 12,282 (56.7%) were occupied by renters.The homeowner vacancy rate was 1.2%; the rental vacancy rate was 3.4%.