At the end of the fourth quarter of 2009, there were 130.58 million housing units in the US. Compare that to the end of 2008 when there were 129.45 million. This is a one year increase of 1.14 million (+0.88%) total housing units. Of total inventory, 85.5 percent or 111.71 million housing units were occupied. 75.04 million, or 57.5 percent, were owner occupied and 36.67 million, or 28.1 percent, were rented. 18.876 million of 130.58 million housing units were vacant (make sure you read the definition above). This is 14.45% of total housing units. ...