Learn more about the data hosted on the Redistricting Data Hub
Select each data type to read an in-depth description.
Data that we host that is also useful for voting rights advocacy and election protection
Learn more about how we ensured that the Precinct Boundaries and Election Results files from our data partners were accurate and reproducible
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 2020. 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 we released 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.
We used Python and the SciPy ecosystem (NumPy, Pandas, GeoPandas, MatPlotLib) to carry out the majority of our validation work. At a high level, our process began 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
Read our Redistricting Readiness Checklist to learn how to use this data in the redistricting process
Visit All About Redistricting to learn more about the rules, criteria, and litigation in each state. The website has information about the redistricting process in each state, including the timing, whether and how public input is incorporated, and criteria. The website is a great resource to consult before using our data to draw maps!
Use our Choose Your Own Mapping Tool to find the right software to draw a Community of Interest or District Map
All of the information you need about a given dataset will be included in the metadata, including column/variable names, methods and processing decisions, sources, dates when the data was retrieved, and any other valuable information about the file. If you have a specific question, please reach out to us!
There are two ways to access data: create a free account and download individual datasets or register as an API user and download multiple datasets at once