Skip Header
U.S. flag

An official website of the United States government

Please be advised that our Call Center will be closed from Saturday, July 2 through Monday, July 4 while the system is undergoing an upgrade. The Call Center will reopen on Tuesday, July 5. Thank you for your patience as we work to improve our Call Center system.

The Correction and Re-Release of the 2008 ACS 1-Year and the 2006-2008 ACS 3-Year Public Use Microdata Sample (PUMS) Files

A small number of errors were detected in the 2008 ACS internal microdata file, leading to errors in the 2008 ACS 1-year PUMS files and the 2006-2008 ACS 3-year PUMS files. Corrected 2008 ACS microdata will be used to produce the 2005-2009 ACS 5-Year and the 2007-2009 ACS 3-year data products as well as all future multiyear PUMS products. The 2008 ACS 1-year PUMS files and the 2006-2008 3-year PUMS files were corrected to the extent they could be without posing a possible disclosure risk.

The following housing variables were corrected: telephone service (TEL), number of rooms (RMSP), number of bedrooms (BDSP), kitchen facilities (KIT), and their respective allocation flags. For more detail on these errors see Errata Note #53 and #54. The "speaking a language other than English at home" (HHL) variable was also corrected due to the editing error referred to in Errata Note #61.

The method used to make the correction involved extracting the corrected 2008 ACS microdata for these items along with the appropriate record identification. This extract was matched to the original 2008 ACS 1-year PUMS records and the incorrect data items were replaced with the corrected data items. The corrected 2008 1-year PUMS file was then used to recreate the 2006-2008 ACS 3-year PUMS file.

In addition, on the 2006-2008 3-year PUMS housing unit-level files, the variable FMVYP has been renamed FMVP so that it is consistent with the documentation and previous files.

The original PUMS files have been removed and replaced with the revised PUMS files for the affected releases. To request the original PUMS files, please send an e-mail to


Back to Header