Boundary Atlas

Wisconsin: cities, counties, ZIP codes and districts

Wisconsin has 8 congressional districts, 33 state senate districts and 99 state house districts under the maps in force for November 3, 2026, plus 7,161 voting precincts, 72 counties, 808 cities, towns and Census-designated places, and 783 ZIP codes.

Cities and towns

Largest first. Each page lists the city's county, districts and ZIP codes.

Congressional districts (2026)

DistrictShort2020 population
Wisconsin's 1st congressional districtWI-01736,715
Wisconsin's 2nd congressional districtWI-02736,715
Wisconsin's 3rd congressional districtWI-03736,716
Wisconsin's 4th congressional districtWI-04736,714
Wisconsin's 5th congressional districtWI-05736,715
Wisconsin's 6th congressional districtWI-06736,714
Wisconsin's 7th congressional districtWI-07736,715
Wisconsin's 8th congressional districtWI-08736,714

ZIP codes in Wisconsin

Each page lists the ZIP's congressional and legislative districts, with population shares where it's split.

Get this in your AI agent

Your agent can list, look up and map every district and precinct in Wisconsin. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

list_geographies(country="US", level="congressional_district", region="WI")