About Our Data

Learn more about the data hosted on the Redistricting Data Hub

Types of Data

Select each data type to read an in-depth description.

Precinct Boundary and Election Results

Precinct level election results merged with precinct boundaries from 2016, 2018, and 2020 were collected by our data partners. We peer reviewed these files as part of our Partner Data Validation effort, and provided detailed reports for each validated dataset. The Redistricting Data Hub team is working on creating 2022 files and making them publicly available.

Voter Files

Voter File data aggregated to census blocks and other geographies are available for all states. This data was purchased by the Redistricting Data Hub from L2, a national voter file vendor.

Incumbent Addresses

The 2020 incumbent address data gathered by Dr. Carl Klarner provides information about current incumbents, including their district number, party registration, gender, race and address. Users will need to request permission to download this data.

Population Projections

HaystaqDNA produced 2020 – 2030 population projections aggregated to the 2010 and 2020 census block and block group levels split into P1 and P2 fields of the PL redistricting file. They are available in CSV and SHP formats.

PL 94-171

The PL 94-171 dataset is the Redistricting Data File created by the U.S. Census Bureau for use by the states in redistricting based on the decennial census. In addition to tabulating the data, our team merged the census data with geographic information, so that it is ready to use in standard mapping softwares.
There are states that have a requirement for modifying the PL 94-171 data prior to redistricting, we maintain a references to those states’ constitutions, statutes, or other rules governing redistricting.
We have formatted a list of the fields and descriptions found in the PL 94-171 dataset found in the 2020 Census State Redistricting Data (Public Law 94-171) Summary File Technical Documentation

Legislative Boundaries

Legislative boundary files for 2011 to the present are re-hosted from All About Redistricting for each state. Legislative boundary files for 2021 and beyond are collected directly from state sources by the Redistricting Data Hub team.

American Community Survey (ACS)

Select fields from the American Community Survey 5-year estimates are available for 2010 to 2021 at the block group, census tract, county, and state level geographies in SHP and CSV format where applicable. The ACS collects a wide range of data, and on our site we host population totals by race and estimates for language spoken at home (not available at the block group level). For more information on field names, see the metadata of your desired dataset.

Citizen Voting Age Population (CVAP)

CVAP Special Tabulation data available for 2010-2021 at the block group, census tract, county, and state level in both SHP and CSV format. 2016-2021 CVAP data is also available at the 2020 block level. Additional CVAP data is available at the Place and MCD (where relevant) for 2018-2021, and SLDU, SLDL, and Congressional Districts level for 2018-2020. Fields were modified to match OMB race categories as used in voting rights analysis. The CVAP data contains estimates by race (for Non-Hispanic/Latino) for total population (not available at the block group or tract levels), voting age population (not available at the block group or tract levels), citizen voting age population, and citizen population. For more information on field names, see the metadata of your desired dataset.

TIGER Boundary Files

Boundary shapefiles are available at several geographies within a state, including blocks, block groups, census tracts, counties, or the entire state. For some states, this may also include 2020 Zip Code Tabulated Areas ZCTAs, American Indian, Alaska Native and Native Hawaiian AIANNH boundaries boundaries and Voting Tabulation Districts VTDs.

Community of Interest (COI) maps

We collected community of interest maps submitted to legislative and congressional redistricting bodies and organizations during the 2021 redistricting cycle. We collected over 10,000 maps in 38 states, and have begun cataloging and uploading them to the Harvard dataverse.

Public Testimony Data

An important part of the redistricting process is public input. To varying degrees, redistricting bodies provide access to the public to share their views, whether that be on the goals of redistricting, the boundaries of proposed maps, the process itself, or something else. This input may be given in a letter, an email, on a website, or in person.

Specialized Data

Data available for download that were created by request. We are continually uploading new data, but you can request that we prioritize creating and rehosting certain datasets. Request a dataset you need for redistricting.

Official adjusted state redistricting datasets

Several states adjust the census data for congressional and/or legislative redistricting purposes, typically to reallocate incarcerated individuals to their last known address. We obtained and rehosted official adjusted datasets in all states but Rhode Island. We have also produced reports that outline the differences between unadjusted and adjusted data at various levels of geography.

Counterfactual Prisoner Adjusted Redistricting Data

Download 2020 Counterfactual Prisoner Adjusted Redistricting Data in 32 States produced by Dr. Rory Kramer and Dr. Brianna Remster of Villanova University. Use these files to understand how prison gerrymandering affects the population in states that do not adjust their census data for redistricting.