Skip to Main Content Site Map


View trainings, access tools, and utilize our other resources to learn more about redistricting data

Contact us for personalized help

Send a question to the Help Desk about redistricting data or the redistricting process in your state. They can also help you get your account set up so you can download data

Ask a Question


View recorded trainings and view slides from previous training sessions

Don’t see the training you need? If you are affiliated with a nonpartisan organization and are looking to learn more, let us know

Request a Training

Case Studies

Helping people understand their districts by providing data to analyze redistricting plans

With the Help Desk’s assistance, Spotlight PA, a nonpartisan investigative journalism publication, created a tool that enables Pennsylvania residents to easily look up information about their old and new districts.

Joining Election Results with Precinct Boundaries to Analyze Proposed Redistricting Plans

The organization Maine Voices Network wanted to support other groups who were presenting a congressional map as a legally compliant alternative to the Maine state legislature’s proposed plan.

Helping Civil Rights Organizations Create a Dataset for Racially Polarized Voting (RPV) Analyses

A member of a civil rights organization contacted the Redistricting Data Hub Help Desk with a question about our data. They had local election results at the district level that they wanted to merge with citizen voting age population (CVAP) data by race.


If you need help understanding or participating in the redistricting process, we have tools to support you.

Mapping Tools

Compare mapping tools and find the one that is best for you, learn how to import and export maps across tools, and find out which tools are used by different states.

Community of Interest Map Collection Project

This project collected Community of Interest (COI) maps submitted to legislative and congressional redistricting bodies in 41 states during the 2021 redistricting cycle.

Public Testimony Data Collection

View written and verbal testimony submitted during the 2021 redistricting cycle in 14 states.

State Reports on Redistricting Criteria

Access numerical summaries of criteria for the 2021 Redistricting Cycle as reported by each State.

Racially Polarized Voting Case Tool

Use this tool to look up Voting Rights Act lawsuits that include racially polarized voting (RPV) analyses from 2010-2021.

State Protectections for Minority Rights in Redistricting

Look up whether your state has a Voting Rights Act or other protections for minority voting rights in redistricting, thanks to volunteers at We the Action.

Redistricting Readiness Checklist

This guide is aimed at helping you familiarize yourself with the knowledge needed to effectively participate in the redistricting cycle by linking you to information and resources at each step of the way.

Organizations Involved in Redistricting

Find out what groups are organizing around redistricting nationally and by state. We do not endorse any of the groups listed, and encourage you to use this as a starting point for getting engaged.

Public Access to State Redistricting Processes

Participate by accessing the online resources to submit public testimony and maps, follow or register to attend upcoming meetings, and view past meeting notes and recordings.


Read articles and watch tutorials about the redistricting process

Redistricting Basics

Answers to fundamental questions about the redistricting process and how to draw and analyze maps: what is redistricting, what is gerrymandering, how to draw legally compliant maps, what data you need, why do we redistrict, when redistricting occurs and who is responsible for redistricting.

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

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.

Florida 2012 Redistricting

A primer on the first case in which a state court struck down a redistricting plan as a partisan gerrymander.

In 2010, the citizens of Florida rallied behind two proposed amendments to the state’s constitution, written by Ellen Freidin of Fair Districts Florida. With over 63% of the vote, Floridians codified the “Fair Districts Amendments,” which put in place two tiers of standards regulating how the Legislature could redistrict for both state legislative and congressional reapportionment.

Frequently Asked Questions


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

Sign Up