 For every 100 females age 18 and over, there were 92.4 males.There were 16,650 housing units at an average density of 1,488.9 per square mile (574.9/km²), of which 12,720 (78.6%) were owner-occupied, and 3,473 (21.4%) were occupied by renters.The homeowner vacancy rate was 1.0%; the rental vacancy rate was 3.6%.