Boundary Atlas

ZIP code 59072: Roundup, MT

ZIP code 59072 is in Roundup (42% of residents), Klein (3.9%) and Camp Three (3.3%), in Musselshell County (99%) and Petroleum County (1.1%), Montana. 51% of its residents live outside city limits. It is in Montana's 2nd congressional district. Its state senate district is State Senate District 19; its state house districts are State House District 38 (99%) and State House District 37 (1.1%).

4,150residents (2020 Census)
1,291.3 sq miland area
4cities and towns
1congressional district
6voting precincts

See it on the mapAll of Montana

City and county

City or townShare of ZIP residents
Roundup42%
Klein3.9%
Camp Three3.3%
Flat Willow Colony0.4%

CountyShare of ZIP residents
Musselshell County99%
Petroleum County1.1%

Town or county subdivisionShare of ZIP residents
Roundup CCD61%
Klein CCD36%
Melstone CCD1.3%
Winnett South CCD1.1%

Congressional district

Congressional districtShare of ZIP residents
Montana's 2nd congressional district (MT-02)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 19100%

State house districtShare of ZIP residents
State House District 3899%
State House District 371.1%

Voting precincts

6 voting precincts overlap ZIP 59072. Map them, with each precinct's share of the ZIP's residents.

Get this in your AI agent

Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:59072")

ZIP 59072 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.