We have all the redistricting data you need to draw or analyze Community of Interest or District maps
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Create a free account and download individual datasets or register as an API user and download multiple datasets at once
The Redistricting Data Hub is your one stop shop for data you can use to draw Community of Interest or District maps
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Answers to fundamental questions about the redistricting process and how to draw and analyze maps
About Our Data
Learn more about the data hosted on the Redistricting Data Hub
Our Process
Partner Validation
The Partner Data Validation project was an effort by our Data Analysts to peer-review the files we re-host from our Data Partners, who took on the task of collecting and making Precinct Boundaries joined with Election Results publicly available for redistricting. In looking at the data being collected, the RDH identified six criteria that we believe encompass most issues that may arise with these data. For each state and data partner, the report that wrote describes in detail what we found for each of these criteria.
We did this because data is critical to court cases. Finding an error that could discredit the dataset can be debilitating and lead to the failure of an argument or defense in court. Additionally, the reports created highlight the benefits and drawbacks of a given partner dataset.
GitHub
We use Python and the SciPy ecosystem (NumPy, Pandas, GeoPandas, MatPlotLib) to carry out the majority of our validation work. At a high level, our process begins by locating Election Results and Precinct Boundaries datasets, cleaning and merging Election Results to Precinct Boundaries, and then comparing the resulting Precinct Boundaries and Election Results file to the equivalent files produced by our Data Partners.
Our API script is available on our GitHub, in order for the script to retrieve data you must be a designated API user. Request access to our API
For more information about our processes and to view our source code, visit our GitHub
Learn more about the Redistricting Process
Local Redistricting
Any legislative body in which members are elected within districts must redraw these boundaries on occasion. That includes not only the US House of Representatives (congressional redistricting) and state legislatures, but also county and city legislative bodies, school districts, judicial districts and more.
Community of Interest (COI)
A community of interest COI is a group of people with shared concerns, interests, and characteristics. Every COI is unique; they might be formed around neighborhoods or the physical landscape, cultures, values, and many other things. Because of these shared interests and concerns, a common redistricting criteria is that COIs be considered during the process.
Racially Polarized Voting (RPV)
Racially Polarized Voting (RPV) analyses are done to determine compliance with the Voting Rights Act (VRA). The VRA was passed in 1965 with the intent to enforce the 15th Amendment. Section 2 of the Voting Rights Act protects against voting practices or procedures that inhibit the right to vote based on race, color, or membership in a language minority group.
Prison Gerrymandering
Prison gerrymandering is the practice of distorting representation by counting incarcerated people in the jail or prison where they are confined, rather than at their place of residence. Since the vast majority of incarcerated people cannot choose which facility to be confined at and are denied the right to vote, where they are counted impacts the representation of the communities to which they belong and in which they are confined.
What people are saying about us
❝ I have been trying to make sure that everyone in the redistricting ecosystem understands the fantastic service you are providing. ❞
❝ I like the idea that it’s being somewhat professionalized, as a resource we can point to, not a black box. It’s not a partisan trick or secret data, it’s publicly available and we can trust it. That’s a financial intangible but we find it valuable. ❞
❝Just wanted to let you know that I have finally downloaded and used tons of the hub’s data and it is AMAZING – thank so so much for putting all the shapefiles up there, I can easily disag/ag in Maptitude and quickly use all the data for analyzing plans. You have saved me weeks of work and I hope you also saved that time for lots of others involved in trying to make redistricting more fair! ❞
❝ When we first saw RDH, we thought “this is too good to be true?” You’ve got all these data from partners and companies we usually have to pay for. For us, it’s like is this data reliable? When we see companies come out with huge data sets. From our perspective it’s been great to have an organization that we can validate against because the last thing we want to do is put out bad information. ❞
Who we are
We are committed to nonpartisanship and ending gerrymandering in all forms.
The nonpartisan Redistricting Data Hub was founded by experts with backgrounds in pioneering redistricting legal cases, the establishment of independent redistricting commissions, and related ballot initiatives in Florida, Arizona and other states.
We believe an effective democracy requires fair representation. Our goal is to provide individuals, civic organizations, and good government groups the data, tools, and knowledge to participate effectively in redistricting processes by learning how to define their communities, provide meaningful public input, recognize gerrymandering, and advocate for fair and legal maps.
Request Data
Don’t see the data you need on our website? We have in progress and specialized datasets that are available upon request
We are in the process of creating new Extended Election Results, Disaggregated Election Results, Redistricting Data Joining, Community of Interest Maps, Racially Polarized Voting Datasets, Local Boundary, and District maps. Express your interest in a particular file and state so we can prioritize it and notify you when it is available to download!
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