 For every 100 females age 18 and over, there were 327.3 males.There were 4,256 housing units at an average density of 530.9 per square mile, of the occupied units 1,974 (51.5%) were owner-occupied and 1,859 (48.5%) were rented.The homeowner vacancy rate was 3.4%; the rental vacancy rate was 7.7%.5,039 people (28.1% of the population) lived in owner-occupied housing units and 4,400 people (24.5%) lived in rental housing units.