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Select a tab to view state-by-state grades, the legal timeline behind the current redistricting landscape, or a plain-language explainer of how partisan maps are constructed.
The Princeton Gerrymandering Project graded every congressional district map drawn after the 2020 census on partisan fairness, competitiveness, and compliance with traditional redistricting criteria. Bars below rank all rated states from lowest to highest fairness score. Hover or tap a bar to read the state-specific finding.
Republicans controlled redistricting for 187 of 435 House seats; Democrats for approximately 75. The remainder were drawn by independent or bipartisan commissions or under divided-government compromise. Source: National Conference of State Legislatures.
GRADES: Princeton Gerrymandering Project 2022 redistricting cycle report card. Scores are composite fairness ratings (0–100). Party control figures: National Conference of State Legislatures, 2021. Timeline events: court records and contemporaneous reporting. Data represent the 2020-cycle maps as rated; some states have since adopted remedial maps under court order.