Table 9. Estimates of the Total Housing Inventory for the United States: 2003 and 2004 (Estimates are in thousands and may not add to total, due to rounding) 90-Percent Confidence Interval (+/- 2004 Type 2003 2004 of 2004 of Percent estimate estimate Estimate difference of total All housing units........ 120,834 122,187 281 388 100 Occupied............... 105,560 106,588 297 409 87 Owner occupied....... 72,054 73,575 298 410 60 Renter occupied...... 33,506 33,013 236 325 27 Vacant................. 15,274 15,599 171 235 13 Year-round vacant.... 11,631 11,884 151 207 10 For rent........... 3,676 3,802 88 120 3 For sale only...... 1,308 1,307 52 71 1 Rented or sold, awaiting occupancy. 976 991 45 62 1 Held off market.... 5,671 5,784 108 147 5 For occasional use 1,989 1,967 63 87 2 Temporarily occupied by persons with usual residence elsewhere 994 1,068 47 63 1 For other reasons.. 2,688 2,749 75 102 2 Seasonal vacant..... 3,643 3,715 87 119 3 \1 A 90-percent confidence interval is a measure of an estimate's reliability. The larger the confidence interval is, in relation to the size of the estiamte, the less reliable the estimate.