Redistricting & Voting Rights

Redistricting Data Suite

The integrated data platform for redistricting professionals, voting rights attorneys, and academic researchers — combining Decennial population, CVAP, VAP, and precinct-level (VTD) data in one place.

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Designed for redistricting professionals
This suite integrates Decennial Census population, Citizen Voting Age Population (CVAP), and Voting Age Population (VAP) data — the core data sources required for Section 2 Voting Rights Act analysis, district compliance, and redistricting litigation support. VTD-level data and advanced tools require a free account.
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CVAP by State
Citizen Voting Age Population choropleth maps and ranked tables for all 50 states — by race and ethnicity. Essential for Section 2 majority-minority district analysis.
State Level By Race Free
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CVAP by County
Drill into county-level CVAP for any state. Identify majority-minority counties, compare racial composition of voting-eligible citizens, and download the full dataset as CSV.
3,100+ Counties CSV 🔒 Login
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CVAP by District
Citizen Voting Age Population at the Congressional District, State Senate, and State House level — choropleth map and ranked table for every district in any state, with CSV download. All three chamber levels in one tool.
CD · SLDU · SLDL CSV Free
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VAP Explorer
Voting Age Population from the Decennial Census — by race, for every state and county. Based on PL 94-171 redistricting data, the official source for district population calculations.
Decennial PL State + County Free
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CVAP Bulk Download
Download CVAP at the VTD (precinct) level for any state — structured CSV ready for GIS, R, or Python. The standard input for expert witness analysis.
VTD / Precinct CSV 🔒 Login
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RPV Analysis Coming Soon
Racially Polarized Voting analysis using ecological inference — the core statistical method in Voting Rights Act litigation. Upload your precinct-level results and CVAP data.
Ecological Inference 🔒 Login
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Effectiveness Analysis Coming Soon
Measure whether minority voters have an effective opportunity to elect candidates of choice under proposed district plans — the legal standard under Thornburg v. Gingles.
Gingles Preconditions 🔒 Login
Data Sources
CVAP — U.S. Census Bureau Special Tabulation, released annually based on ACS 5-Year Estimates; available at state, county, tract, block group, and VTD levels.  ·  VAP — Decennial Census PL 94-171 Redistricting Data; the official population data mandated for legislative apportionment.  ·  Decennial — 2020 Census (latest full enumeration). All data retrieved live from public U.S. Census Bureau APIs.