Public Use Microdata Areas (PUMAs) are geographic areas for which the Census Bureau provides selected extracts of raw data from a small sample of census records that are screened to protect confidentiality. These extracts are referred to as public use microdata sample (PUMS) files. For the 2010 decennial census, each state delineated PUMAs for use in presenting PUMS data based on a 5 percent sample of decennial census or American Community Survey data. These areas are required to contain at least 100,000 people.

The Integrated Public Use Microdata Series (IPUMS-USA) consists of more than fifty high-precision samples of the American population. IPUMS is published and maintained by the Minnesota Population Center, University of Minnesota.

Source of definition:

Note on IPUMS-USA: For additional information on IPUMS, visit the IPUMS-USA Web site.

For a quick view of a correlation of most PUMAs with counties, view a PUMA by county list.

For a list of which counties and/or which parts of counties are associated with which PUMAs, and for maps of the 2010 PUMAs for Illinois (determined after the 2010 census), see the page, 2010 Census Public Use Microdata Area (PUMA) Reference Maps – Illinois, on the U.S. Census Bureau Web site. All data currently available on the IECAM website is post-2010.

Note on data availability by PUMA: IECAM does not report data by PUMA in its online database. Some language data (e.g., specific languages spoken by children age 0-5) are reported by PUMA in the Additional Data section of the IECAM Web site.

Web Resources