 For every 100 females age 18 and over, there were 99.9 males.There were 11,915 housing units at an average density of 556.3 per square mile (214.8/km²), of which 6,525 (60.5%) were owner-occupied, and 4,256 (39.5%) were occupied by renters.The homeowner vacancy rate was 2.9%; the rental vacancy rate was 9.2%.