Resources
Interactive maps I have built, and the data, tools, and news I rely on in my redistricting work — gathered here for students, journalists, and anyone following the field.
Interactive Maps & Visualizations
Maps and cartograms I build for research and teaching. Explore a few below, or browse the full collection.
- Who counts in 2030 If apportionment counted only citizens and green-card holders, three seats would move — and Texas would lose one.
- Mid-decade congressional redistricting Expected partisan seat shifts from the newly enacted 2026 maps.
- The 2022 U.S. House on an equal-area cartogram Every district drawn the same size, morphing to and from the geographic map.
- Change in House apportionment Which states gained and lost seats, from 2000 through the 2030 projection.
- Where nobody lives The 2,368,443 census blocks that recorded no residents in 2020 — 29% of every block in the country, covering 41.5% of its land. Click a state to zoom in.
- Browse all interactive maps The complete set, including the cartogram studio and method write-ups.
Data & Mapping Tools
Where I go for clean redistricting data and for tools to draw and score maps.
- Redistricting Data Hub Cleaned, precinct-level election results and census data, ready for analysis.
- Dave's Redistricting App Draw and evaluate district maps in the browser, with partisan and demographic scoring.
- PlanScore Nonpartisan gerrymandering analysis and partisan-fairness scores for enacted and proposed plans.
- Census Bureau — Redistricting Data Program The official P.L. 94-171 population and geographic files states use to redistrict.
Law, Litigation & Commentary
The sources I follow for redistricting law, court cases, and day-to-day developments.
- All About Redistricting Justin Levitt's guide to the rules and the litigation, tracked state by state.
- Election Law Blog Rick Hasen's running coverage of election law, including redistricting cases.
- Princeton Gerrymandering Project Redistricting Report Card grades and analysis of maps nationwide.