ZIP code 59345: Custer County, MT
ZIP code 59345 is in Custer County (55%) and Powder River County (45%), Montana, outside any city or Census-designated place. It is in Montana's 2nd congressional district. Its state senate district is State Senate District 17; its state house district is State House District 34.
See it on the mapAll of Montana
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Custer County | 55% |
| Powder River County | 45% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| South Custer CCD | 51% |
| East Powder River CCD | 44% |
| Shirley-Ismay CCD | 4.5% |
| Broadus CCD | 1.1% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Montana's 2nd congressional district (MT-02) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MT-02) | Troy Downing (R) | 202-225-3211 | 100% |
| U.S. Senator | Steve Daines (R) | 202-224-2651 · contact form | statewide |
| U.S. Senator | Tim Sheehy (R) | 202-224-2644 | statewide |
| State Senator (State Senate District 17) | Bob Phalen (R) | 406-939-1187 | 100% |
| State Representative (State House District 34) | Jerry Schillinger (R) | 100% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Custer County website: https://custercountymt.gov/
- Custer County laws: search for the Custer County, Montana code of ordinances
- Powder River County laws: search for the Powder River County, Montana code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 17 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 34 | 100% |
Voting precincts
3 voting precincts overlap ZIP 59345. 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://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:59345")
ZIP 59345 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.