Carter County, Montana ZIP codes
4 ZIP codes are in Carter County, plus 6 that cross in from neighboring counties.
- ZIP codes
- 4
- Population in these ZIPs
- 1,100
- Avg. median income
- $58,100population-weighted
- Cities & towns
- 4
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ZIP codes in Carter County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 59311 | Alzada | 143 | $88,021 | — |
| 59319 | Capitol | 40 | — | — |
| 59324 | Ekalaka | 777 | $57,188 | $135,100 |
| 59332 | Hammond | 140 | $32,241 | — |
ZIP codes partly in Carter County
These ZIP codes are mostly in a neighboring county but cover part of Carter County.
| ZIP code | City | State | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|---|
| 57717 | Belle Fourche | SD | Butte County | 8,983 | $77,689 | $358,000 |
| 57724 | Camp Crook | SD | Harding County | 167 | $61,146 | — |
| 59313 | Baker | MT | Fallon County | 2,111 | $78,015 | $191,500 |
| 59316 | Boyes | MT | Powder River County | 15 | $48,750 | — |
| 59336 | Ismay | MT | Custer County | 220 | $64,375 | $293,200 |
| 59344 | Plevna | MT | Fallon County | 406 | $110,455 | $193,100 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Carter County
Nearby counties
Frequently asked questions
How many ZIP codes are in Carter County, Montana?
4 ZIP codes are mainly in Carter County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Carter County?
ZIP codes in Carter County use the city names Alzada, Capitol, Ekalaka and Hammond.