Phase 4 Collection of Post-2020 Census Congressional and State Legislative District Plans / Non-Partisan Liaisons

Dear Liaison,

The U.S. Census Bureau is preparing to update its information regarding both congressional district and state legislative district plans in our geographic database. We routinely collect updates and produce data products reflecting the boundaries of these areas as part of the Collection of Post-2020 Census Congressional and State Legislative District Plans (Phase 4) of the Redistricting Data Program. Our current congressional district plans are those that represent the 119^th Congress. Our current state legislative district plans are those that represent the areas provided/confirmed for the 2024 election cycle. We request notification of any changes to these two important geographic areas or confirmation that there are no changes.

Please perform one of these two possible actions and return the form through email to <rdo@census.gov>:

1. Return the attached form indicating that there are no changes to the districts.

2. Return the attached form indicating that there are changes and if:

• Changes are based on whole blocks.

• Changes include split blocks.

If there are changes to the congressional and/or state legislative districts, please use the attached procedures (Phase 4 Guide) to create and submit your changes to the Census Bureau. If the changes involve split blocks, the data and software needed to submit those changes will not be available until early January 2026, at which time we will notify you of its availability.

We look forward to hearing from you at your earliest convenience. If you have any questions regarding this request, please contact James Whitehorne, Chief of the Redistricting & Voting rights Data Office at 301-763-4039 or at <rdo@census.gov>.

Sincerely,

James Whitehorne

Attachments

Phase 4 Certification Form – Multiple CD States

Phase 4 Guide