The 2020 Census Redistricting Data (P.L. 94-171) Summary Files in the Legacy Format were posted for FTP download, by state, on August 12, 2021 and released on data.census.gov with the full redistricting toolkit on September 16, 2021. Both releases contained the same data, only the format was different.

The summary file tables include:

• P1. – Race
• P2. – Hispanic or Latino, and not Hispanic or Latino by Race
• P3. – Race for the Population 18 Years and Over
• P4. – Hispanic or Latino, and not Hispanic or Latino by Race for the Population 18 Years and Over
• P5. – Group Quarters Population by Major Group Quarters Type
• H1. – Occupancy Status (Housing)

The 2020 Census Redistricting Data (P.L. 94-171) Summary File data are available for all 50 states, the District of Columbia, and the Commonwealth of Puerto Rico through data.census.gov and FTP download (in the Legacy Format).

The 2020 Census State Redistricting Data (P.L. 94-171) Summary File Technical Documentation is available in English, and in Spanish specifically for Puerto Rico. The 2020 Census National Redistricting Data (P.L. 94-171) Summary File Technical Documentation is available in English only. Links to the Technical Documentation are provided below.

Legacy Format Support Materials are provided to help data users work with the legacy format summary files. These materials include header records for each of the data segments in the summary file, Microsoft Access shells, an instructional guide and video tutorial that provide step-by-step instructions on how to download the legacy format data and import the data into the Microsoft Access Shells, and SAS and R statistical software import scripts. Links to these support materials are provided below.

The Census Bureau published a Federal Register Notice on the Final 2020 Census Residence Criteria and Residence Situations on February 8, 2018. In the Notice, the Census Bureau stated we will continue the practice of counting prisoners at the correctional facility, to ensure that the concept of usual residence is interpreted and applied consistent with the intent of the Census Act of 1790. The Notice also stated the Census Bureau recognizes that some states have decided, or may decide in the future, to ‘move’ their group quarters (GQ) population (e.g. student, military, and prisoner population) to an alternate address for the purpose of redistricting. To assist those states, the Census Bureau is offering the use of a geocoding service. This service was updated with 2020 Census geographic data in January 2021, to assist states with their goals of reallocating GQ population for legislative redistricting.

In declarations filed in the case of Ohio v. Raimondo, the U.S. Census Bureau made clear that we could provide a legacy format redistricting data summary file to all states by mid-to-late August 2021, now realized as August 12. We also met our commitment to provide the full redistricting data toolkit by Sept. 30, 2021, with delivery on Sept. 16, 2021.