 For every 100 females age 18 and over, there were 89.2 males.There were 15,947 housing units at an average density of 1,826.8 per square mile (705.4/km²), of which 10,889 (71.6%) were owner-occupied, and 4,323 (28.4%) were occupied by renters.The homeowner vacancy rate was 0.9%; the rental vacancy rate was 4.9%.