Redistricting Data & Technology
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Draft Census Rule Would Affect Apportionment and Block-Level Race Data
A draft federal rule circulating within the Trump administration would change both who the census counts for congressional apportionment and ... Read More
The BBSP Deadline Passed. Now What? A Guide for Local Officials
The Census Bureau's May 29, 2026, deadline for Block Boundary Suggestion Project submissions has come and gone. For local officials and ... Read More
The Boundary Annexation Survey (BAS) Submission Checklist for Local Governments
The Boundary and Annexation Survey (BAS) is the Census Bureau's annual check-in with local government on where its legal boundaries ... Read More
Technology News and Updates
BBSP vs. BAS: Two Census Programs, Two Crucial Jobs
The Boundary and Annexation Survey (BAS) and the Block Boundary Suggestion Project (BBSP) are often conflated; both involve local geography ... Read More
From 1990 to 2030: A Short History of the Census Block-Boundary Suggestion Project
The Block Boundary Suggestion Project (BBSP) is now in its fourth decade. It began as part of the Census Bureau's ... Read More
Why the 2030 Census LUCA Program Matters to Redistricting and GIS Staff
The Local Update of Census Addresses operation is the first to occur in every decennial census cycle, and it gives ... Read More
Five Census Bureau Tools Every Local Election Official Should Bookmark
The Census Bureau offers a growing suite of free, browser-based tools that are directly useful for local election administration and ... Read More
Why the Boundary and Annexation Survey (BAS) Matters for Local Redistricting Officials
Every year, the U.S. Census Bureau invites tribal, state, and general-purpose local governments, counties, cities, towns, and minor civil divisions ... Read More
New GOP Lawsuit Targets Differential Privacy and Group Quarters Imputation, Claiming Flawed 2020 Census Data
A federal lawsuit challenging the underlying data of the 2020 U.S. Census has been filed in a Florida federal court ... Read More
2020 Census Data Visualization Tool
2020 Apportionment Quick Data
U.S. Census Bureau Interactive Historical Apportionment Map
