We have all the redistricting data you need to draw or analyze congressional and state legislative maps, and fight gerrymandering

Download Data

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

State Menu

Select a state to download datasets individually

Sign Up for Our Mailing List

Stay up to date on data releases, training opportunities and how to get involved in the redistricting process in your state

Not sure where to start?

If you need help using our data to draw or analyze redistricting maps, we have the resources to support you.

Contact us for personalized help

The Help Desk is here for you to answer questions about redistricting data and the redistricting process in your state. They can also help you get your account set up so you can download data.

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 Values

Quality

Our team takes pride in producing high quality data for nonpartisan redistricting. We do this by collecting data from trusted and official sources, checking the data for internal consistency and validating it against alternative datasets, soliciting feedback from stakeholders and users, and regularly auditing our processes to see what we can improve. As a result, our data has been used by expert witnesses in litigation, journalists, academics, and others who have appropriately high expectations for data quality.

In rare instances where we need to update a file, we notify all users who have downloaded that dataset that an updated file is available, and what the changes were.

Transparency

We understand the importance of documentation and transparency for using our data. As a result, we meticulously track any data collection efforts and retain all “raw from source” materials, which are available on request. Every dataset is accompanied by a ReadMe that outlines raw data sources and processing steps.

We use Python and the SciPy ecosystem (NumPy, Pandas, GeoPandas, MatPlotLib) to carry out the majority of our work. We post the code containing our notes and data processing steps on our GitHub. Our team is always available via the Help Desk for additional questions about sourcing and methodology.

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. ❞

— Rebecca Theobald, GeoCivics

❝ 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. ❞

— Jordan Brandt, MA Voter Table

❝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! ❞

— Ruth Greenwood, Campaign Legal Center

❝ 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. ❞

— Jason Kostyk, Virginia Public Access Project

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.

Let us know what you need for your nonpartisan redistricting work and when, and we’ll let you know when your data is ready to download.

Learn More