Start from the current 118th Congress map — the actual jagged district boundaries used today — drawn from the JeffreyBLewis congressional boundaries dataset. Expand the total via the slider or override specific states, and any state whose seat count diverges from reality falls back to a Voronoi tessellation seeded by 2020-population counties (the rest stay real-shaped). Partisan lean per district is computed from the actual 2020 D / R vote totals of the counties inside the district. Pan with click+drag, zoom with the scroll wheel.