 For every 100 females, there were 91.2 males.For every 100 females age 18 and over, there were 87.7 males according to the census.There were 20,686 housing units at an average density of 1,858.0 per square mile (717.4/km2), of which 12,371 (63.1%) were owner-occupied, and 7,221 (36.9%) were occupied by renters.