Public Use Microdata Area Boundaries in 2012 ACS PUMS files

For those who use Public Use Microdata Areas (PUMAs) in the PUMS files, note that the 2008-2012 and 2010-2012 multiyear files are different than previous files because they include two sets of PUMA boundaries. According to the Census Bureau's data documentation:

"Due to disclosure avoidance procedures, the ACS PUMS does not release overlapping geographies for any record. Therefore the records from data years 2008 through 2011 still carry the older 2000-based PUMA codes. Only the 2012 records display the newer 2010-based PUMA geography."

For those accessing data for PUMAs from these files, this means that PUMA codes come from two different variables (and geographic boundaries may differ) depending on the survey year in which the respondent was interviewed (2012 vs. earlier years).

See data documentation here:
www.census.gov/.../ACS2010_2012_PUMS_README.pdf