Boundary Atlas

Montana: cities, counties, ZIP codes and districts

Montana has 2 congressional districts, 50 state senate districts and 100 state house districts under the maps in force for November 3, 2026, plus 728 voting precincts, 56 counties, 497 cities, towns and Census-designated places, and 369 ZIP codes.

Cities and towns

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

Congressional districts (2026)

DistrictShort2020 population
Montana's 1st congressional districtMT-01542,112
Montana's 2nd congressional districtMT-02542,113

ZIP codes in Montana

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 Montana. 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="MT")