Three decades of congressional gerrymandering — explore how redistricting shaped partisan outcomes in every US state from 1992 to 2024.
🌐 Live site: districtdrift.org
| Desktop | Mobile |
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District Drift is a free, nonpartisan, public-interest website that documents the history of congressional redistricting in the United States across five cycles: 1992, 2002, 2012, 2022, and 2024.
It is backward-looking — a historical record for the general public, journalists, and educators showing how congressional maps have been drawn and who benefited. Both parties have gerrymandered; this site shows all of it.
Key features:
- Nation view — all 50 states ranked and colored by efficiency gap, with animated seat-change overlays across redistricting cycles
- State view — district-by-district maps with boundary morph animations between cycles
- Partisan metrics — efficiency gap, mean-median difference, seat/vote ratio, competitiveness
- Demographics — race, income, and education per district per cycle
- Precinct layer — raw precinct vote data for all 50 states (2012 and 2022 cycles)
- Historical events — key redistricting events and litigation for all 44 states with congressional districts
- Mobile-optimised — full touch support, pinch-zoom, bottom-sheet panels, and glassmorphism UI
| Layer | Technology |
|---|---|
| Frontend | SvelteKit (static output) |
| Maps | MapLibre GL JS + PMTiles |
| Charts | D3.js (direct SVG) |
| Pipeline | Python + GeoPandas + Tippecanoe |
| Hosting | Cloudflare Pages + Cloudflare R2 |
- NHGIS (U of Minnesota) — congressional district boundaries, 103rd–118th Congress; census demographics
- MIT Election Lab — US House election returns 1976–2024
- Redistricting Data Hub — VEST precinct shapefiles
- Princeton Gerrymandering Project — historical partisan scores
See CONTRIBUTING.md for full setup instructions.
# Pipeline (Python)
cp .env.example .env # add your free NHGIS API key
uv run python -m pipeline.download
uv run python -m pipeline.process
uv run python -m pipeline.tile
# Frontend
cd web && npm install && npm run devCC BY-NC-SA 4.0 — free to use and adapt with attribution, non-commercial only. Copyright © 2026 Kana Nadarajan