Table 4. Estimates of the Total Housing Inventory for the United States: Second Quarter 2006 and 2007 (Estimates are in thousands and may not add to total, due to rounding) Second Second 90-Percent quarter quarter Confidence Interval (±)a 2007 Type 2006 2007 of 2007 of Percent estimate estimate estimate difference of total All housing units................. 125,800 127,728 (X) (X) 100 Occupied........................ 109,450 110,341 308 279 86 Owner occupied................ 75,227 75,283 629 429 59 Renter occupied............... 34,223 35,058 542 417 27 Vacant.......................... 16,350 17,387 366 322 14 Year-round vacant............. 12,376 13,057 358 306 10 For rent.................... 3,676 3,731 171 191 3 For sale only............... 1,729 2,037 108 131 2 Rented or sold, awaiting occupancy.......... 1,186 1,199 76 106 1 Held off market............. 5,785 6,090 252 217 5 For occasional use........ 1,850 2,023 148 126 2 Temporarily occupied by persons with usual residence elsewhere. 1,204 1,109 110 98 1 For other reasons......... 2,731 2,958 178 152 2 Seasonal vacant............... 3,974 4,330 239 205 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.