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Now Available: 2020 Post-Enumeration Survey (PES) Results for the 50 states and District of Columbia.

Participant Statistical Areas Program (PSAP)

2020 Census PSAP

The 2020 Census PSAP enabled invited participants to review and verify selected statistical area boundaries for 2020 Census data tabulation following U.S. Census Bureau guidelines and criteria. The program ran from March 2018 until March 2021. The Census Bureau will use the statistical areas defined for the 2020 Census to tabulate data for the annual American Community Survey (ACS) estimates and the Economic Census. These data are used to:

  • Prepare grant applications to fund community and regional development, education, agriculture, energy, and environmental programs, as well as other needed community improvements and enhancements.
  • Plan for future community needs. The next opportunity to review and delineate statistical areas is planned for the 2030 Census.

There were two types of statistical geographies, standard and tribal, available for review under the 2020 Census PSAP.

Standard statistical geographies included:

  • Census tracts.
  • Block groups.
  • Census designated places (CDPs).
  • Census county divisions (CCDs), in selected states.


Tribal statistical geographies included:

  • Tribal census tracts (TCTs).
  • Tribal block groups (TBGs).
  • Census designated places (CDPs).
  • Alaska Native village statistical areas (ANVSAs).
  • Oklahoma tribal statistical areas (OTSAs).
  • OTSA tribal subdivisions.
  • Tribal Designated Statistical Areas (TDSAs).
  • State Designated Tribal Statistical Areas (SDTSAs).

What Was New for the 2020 Census PSAP?

  • The former Tribal Statistical Areas Program (TSAP) was included as part of the 2020 Census PSAP. Federally recognized tribes and state tribal liaisons had the opportunity to update tribal statistical geographies in 2020 Census PSAP.
  • To reduce participant burden, the Census Bureau provided proposed 2020 Census tracts and block groups for review and update by PSAP participants. Participants accepted the Census Bureau’s 2020 Census tracts and block groups, updated the proposed tracts and block groups, or used the 2010 Census statistical area geography as a base to make updates (see "2020 Census Tract and Block Group Proposed Changes Files" below).
  • Participants that reviewed standard statistical area geographies were required to use the Census Bureau’s Geographic Update Partnership Software (GUPS) to delineate updates. The GUPS runs in QGIS, which is an open source Geographic Information System (GIS), and it contains all functionality required to make 2020 Census PSAP updates, execute automated checks for program criteria compliance, and create standardized data output files for Census Bureau processing.
  • Participants that used the GUPS to update their statistical areas also used the Secure Web Incoming Module (SWIM) to send their updates. The SWIM is the official web portal for uploading partnership materials to the Census Bureau.
  • Tribal participants that reviewed TCTs, TBGs, or CDPs also used the GUPS or elected to use the Census Bureau provided paper maps to review and edit tribal statistical geographies.
  • Participants reviewed ANVSAs, OTSAs, OTSA tribal subdivisions, TDSAs, or SDTSAs by Census Bureau paper maps to review and edit tribal statistical areas.

Contact Information

Contact the Census Bureau by email at to address PSAP questions.



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