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  • 2020
  • 2010
  • 2000

Geographic Relationships Over Time (Comparability)

These files show the relationships (comparability) for the same type of geography over different periods of time.

Block Relationship Files

The 2020 Census Redistricting Data (P.L. 94-171) Block Relationship files are provided as a tool to help users compare the universe of 2010 Census tabulation blocks to the universe of 2020 Census tabulation blocks. The Block Relationship files are created for each of the 50 states, the District of Columbia, and the Commonwealth of Puerto Rico.



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