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Main site for redistricting resources from the National Conference of State Legislatures. Includes state-level overviews on topics such as: redistricting criteria, data requirements, public input requirements, free and equal election clauses, laws on reallocating prisoners, etc.
A project of the Prison Policy Initiative, The Prison Gerrymadering Project provides information, news, data, and opportunities for involvement in relation to how the Census Bureau's counting of prisoners impacts district representation.
DRA 2020 is a free web app to create, view, analyze and share redistricting maps for all 50 states and the District of Columbia. DRA 2020 includes demographic data from the 2010 census and 2018 5-Year ACS estimates and extensive election data. Official congressional and legislative district maps are included and can be used to start new maps, or you can create maps from scratch. A comprehensive feature set makes it easy to create and modify maps while keeping them within the accepted parameters. DRA 2020 also includes a rich set of analytics, including measures of proportionality, competitiveness, minority representation, compactness and splitting.