A minor error was recently discovered in the 2005 ACS sample data. The error affected the data for only 13 sample housing units and 25 sample persons. These 13 sample housing units are in 13 different states (none are in Puerto Rico).

Due to the nature of the data products tabulations, many tables from the August 29 ACS income and poverty release were affected. However, each of the corrected estimates is within the margin of error of the original estimate. Furthermore, almost all of the corrected estimates represent less than a 1% change from the original estimate. The data products from the August 29 data release that are affected will be re-issued on October 19. All data products included in the October 3rd data release have been corrected in time for that release. There was no effect on the data products released on Aug. 15. And the data products to be released on Nov. 14 (the final ACS data release for this year) are being corrected and verified now. These changes will affect 101 detailed tables (and certain other data products derived from these tables) across 145 geographic entities, about 2% of the roughly 7,000 geographic areas for which the 2005 ACS data products are published. However, many of these geographic areas will have changes in only a few data tables. The spreadsheet file of release 2 corrections contains detailed information on the geographic areas and the data tables affected by this error.