TIGER/Line Shapefile, 2013, Series Information File for the 2010 Census Public Use Microdata Area State-based Shapefile
After each decennial census, the Census Bureau delineates
          Public Use Microdata Areas (PUMAs) for the tabulation and dissemination of decennial
          census Public Use Microdata Sample (PUMS) data, American Community Survey (ACS) PUMS data,
          and ACS period estimates. Nesting within states, or …