HousingUnits.AlexCity.USCensusBureau
In reviewing the data from Census Bureau, I find that the City of Alexandria has 6,547 total housing units. Of those 6,158 are occupied, 3.388 are owner-occupied and 2,770 are renter-occupied, a 55% to 45% differential.
This study is from 2005-2009, we should be getting a new census report soon.

Source: US Census Bureau