Creating PUMAs for pre 2012 ACS geographic area

PUMAs have been in use since 1990. Similar units--"county groups"--also exist for 1980 and 1970, and IPUMS USA has defined PUMAs for 1960 as well.

The 2012 ACS is, however, the first ACS year to use _2010_ PUMA definitions. The 2005-2011 ACS instead use _2000_ PUMA definitions

This page on the IPUMS USA website provides definitions for all of these concepts, along with some crosswalks, boundary files, composition files, etc.:
usa.ipums.org/.../tgeotools.shtml

IPUMS USA has also used the PUMA codes in all ACS samples (2005 to the present) to identify 2013 metro areas to the extent possible. See usa.ipums.org/.../MET2013. That page also explains how IPUMS USA handles cases where PUMAs don't align with metro area boundaries, and it provides crosswalks between PUMAs and metro areas (for all ACS years).

PUMAs have been in use since 1990. Similar units--"county groups"--also exist for 1980 and 1970, and IPUMS USA has defined PUMAs for 1960 as well.

The 2012 ACS is, however, the first ACS year to use _2010_ PUMA definitions. The 2005-2011 ACS instead use _2000_ PUMA definitions

This page on the IPUMS USA website provides definitions for all of these concepts, along with some crosswalks, boundary files, composition files, etc.:
usa.ipums.org/.../tgeotools.shtml

IPUMS USA has also used the PUMA codes in all ACS samples (2005 to the present) to identify 2013 metro areas to the extent possible. See usa.ipums.org/.../MET2013. That page also explains how IPUMS USA handles cases where PUMAs don't align with metro area boundaries, and it provides crosswalks between PUMAs and metro areas (for all ACS years).