Table 4. Estimates of the Total Housing Inventory for the United States: First Quarter 2006 and 2007 (Estimates are in thousands and may not add to total, due to rounding) First First 90-Percent quarter quarter Confidence Interval (±)a 2007 Type 2006 2007 of 2007 of Percent estimate estimate estimate difference of total All housing units................. 125,373 127,266 (X) (X) 100 Occupied........................ 109,289 109,704 316 283 86 Owner occupied................ 74,883 75,006 630 430 59 Renter occupied............... 34,406 34,698 540 417 27 Vacant.......................... 16,084 17,562 368 321 14 Year-round vacant............. 12,176 13,392 362 307 11 For rent.................... 3,685 3,956 176 194 3 For sale only............... 1,580 2,179 112 131 2 Rented or sold, awaiting occupancy.......... 1,070 1,088 72 101 1 Held off market............. 5,841 6,169 254 218 5 For occasional use........ 1,837 1,977 146 125 2 Temporarily occupied by persons with usual residence elsewhere. 1,328 1,252 117 103 1 For other reasons......... 2,676 2,940 178 151 2 Seasonal vacant............... 3,908 4,170 234 202 3 aA 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 estimate, the less reliable the estimate. (X) Not Applicable. Since the number of housing units is set equal to an independent national measure, there is no sampling error, and hence no confidence interval. NOTE: Since first quarter 2003, the Current Population Survey/Housing Vacancy Survey (CPS/HVS) estimates have been controlled to independent housing unit counts. Doing so should make the CPS/HVS estimate of housing units more comparable to other Census Bureau housing surveys.