There were 38,679 housing units at an average density of 632.3 per square mile (244.1/km), of which 19,968 (55.3%) were owner-occupied, and 16,162 (44.7%) were occupied by renters. The homeowner vacancy rate was 2.3%; the rental vacancy rate was 6.9%. 48,179 people (53.6% of the population) lived in owner-occupied housing units and 39,662 people (44.1%) lived in rental housing units.