The Census API provides ACS 5 data for 2011 and 2012 (along with more recent years).

The Census's TIGERweb services provides census tract geometries for the 2013 ACS release and the 2010 Decennial Census.

Are the census tracts used in the 2011 ACS and 2012 ACS the same as either the 2010 or 2013 geometries? If not, is there a web service that provides the 2011 and 2012 geometries?

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    Are you in need of the formats provided by the API system or are you willing to go into GIS shaepfile / GDB territory?
    – Kotebiya
    Oct 23, 2016 at 16:23
  • Hi @Kotebiya, I am looking for a web service that provides appropriate geometries for the 2011 and 2012 ACS.
    – fgregg
    Oct 23, 2016 at 16:31
  • Well, I can tell you that it is recommended to use 2013 Census Tracts for 2013 ACS data and 2010 Census Tracts for 2010 Census Data. You could try using shapefile data for 2011 and 2012 data.
    – Kotebiya
    Oct 23, 2016 at 17:27

1 Answer 1


According to the Census website, for both the 2012 and 2011 Estimate Year, Census Tract uses the 2010 Census (https://www.census.gov/programs-surveys/acs/geography-acs/geography-boundaries-by-year.2012.html and https://www.census.gov/programs-surveys/acs/geography-acs/geography-boundaries-by-year.2011.html)

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