Petroleum County, Montana ZIP codes
2 ZIP codes are in Petroleum County, plus 3 that cross in from neighboring counties.
- ZIP codes
- 2
- Population in these ZIPs
- 395
- Avg. median income
- $62,800population-weighted
- Cities & towns
- 2
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ZIP codes in Petroleum County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 59084 PO Box | Teigen | — | — | — |
| 59087 | Winnett | 395 | $62,813 | $178,600 |
ZIP codes partly in Petroleum County
These ZIP codes are mostly in a neighboring county but cover part of Petroleum County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 59032 | Grass Range | Fergus County | 409 | $42,000 | $318,800 |
| 59058 | Mosby | Garfield County | 54 | — | $250,000 |
| 59072 | Roundup | Musselshell County | 4,690 | $59,594 | $229,200 |
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 Petroleum County
Nearby counties
Frequently asked questions
How many ZIP codes are in Petroleum County, Montana?
2 ZIP codes are mainly in Petroleum County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Petroleum County?
ZIP codes in Petroleum County use the city names Teigen and Winnett.