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The Participant Statistical Areas Program was a geographic program within the 2010 Decennial Census Program that offered regional and local participants the opportunity to review and update, if necessary, statistical geographic entities for use in tabulating and publishing data from Census 2010, the American Community Survey (ACS), and potentially other censuses and surveys. The four statistical geographic entities included in the PSAP were county-based census tracts, block groups, census designated places (CDPs), and census county divisions (CCDs) (including census subareas in Alaska). The PSAP and the TSAP are parallel geographic programs. The primary participants in PSAP were organizations representing regional groupings of governments. Tribes worked with the primary PSAP participant(s) for their area of interest to help ensure that tribal data needs were met through the statistical geographic entities defined via the PSAP as well as via the TSAP. For example, a CDP delineating an unincorporated community located off of an AIR, ORTL, or OTSA for which data would be useful for a tribe was defined via the PSAP, not the TSAP.