 For every 100 females age 18 and over, there were 88.9 males.There were 30,269 housing units at an average density of 649.5 per square mile (250.8/km2), of which 21,104 (76.9%) were owner-occupied, and 6,357 (23.1%) were occupied by renters.The homeowner vacancy rate was 4.1%; the rental vacancy rate was 6.8%.