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Public Use Microdata Areas (PUMAs) are statistical geographic areas defined for the dissemination of Public Use Microdata Sample (PUMS) data. They are also used for disseminating American Community Survey (ACS) and Puerto Rico Community Survey period estimates.1
The Census Bureau offered the State Data Centers (SDCs) in each state, the District of Columbia, and Puerto Rico the opportunity to delineate 2010 PUMAs within their state or equivalent entity using the Census Bureau's 2010 PUMA criteria and guidelines. The Census Bureau also asked the SDCs to involve interested individuals and regional organizations, especially those that officially represented counties and cities with populations over 100,000 people, to ensure that the PUMAs meet the needs of a variety of data users. The SDCs for Guam and the U.S. Virgin Islands did not delineate their 2010 PUMAs because their populations did not exceed 200,000 people, the minimum threshold to delineate more than one PUMA.
1 PUMAs were initially adopted by the ACS because they were the only wall-to-wall geographic entities below the state level that met the minimum population threshold of 65,000 required to disseminate ACS 1-year period estimates.
2 American Samoa, the Commonwealth of the Northern Mariana Islands, and the U.S. Minor Outlying Islands are the only areas included in the decennial census that are not covered by PUMAs, because each area contains of less than the required 100,000 people.