Petroleum County, Montana
Petroleum County, Montana, has 548 residents (July 2025 estimate). Its county seat is Winnett. It uses Mountain Time and covers 1,656 sq mi (4,288 km²) of land.
- Resident population, July 2025
- 548
- Land area
- 1,656 sq mi (4,288 km²)
- County seat or government
- Winnett
- Time zone
- Mountain TimeUTC-07:00 in January; UTC-06:00 in July
- Median household income
- $60,208 ± $16,682
- Median home value
- $201,400 ± $49,436
- Median rent, with utilities
- $800 ± $227
- Homes lived in by their owners
- 72.9% ± 14.7 points
- County type
- County
- Metro or micro area
- Outside any metro or micro area
- Water area
- 18.9 sq mi (48.9 km²)
- State
- Montana
- County code (FIPS)
- 30069
- Coordinates (central point)
- 47.141917, -108.226575
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Petroleum County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Mountain TimeAmerica/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
4 ZIP Code areas overlap Petroleum County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
Petroleum County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Petroleum County, largest first
- Winnett K-12 Schools447 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Winnett, Montana (town)204 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Musselshell County, Montana45 mi south
- Fergus County, Montana48 mi west
- Garfield County, Montana58 mi east
- Phillips County, Montana78 mi north
- Rosebud County, Montana100 mi southeast
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.