Petroleum County
Also known as Petroleum County, Montana, Petroleum County, MT
county in Montana, United States
Key facts
- Country
- United States
- State
- Montana
- Founded
- February 25, 1925
- Named after
- Petroleum fields
- Seat
- Winnett
- Largest town
- Winnett
- Total
- 1,674 sq mi (4,340 km )
- Land
- 1,655 sq mi (4,290 km )
- Water
- 19 sq mi (49 km ) 1.1%
- Density
- 0.300/sq mi (0.116/km )
- Time zone
- UTC−7 ( Mountain )
- Summer dst
- UTC−6 ( MDT )
- Congressional district
~10 min read
Article
Petroleum County is a county in the U.S. state of Montana. As of the 2020 census, the population was 496, making it the least populous county in Montana and the eighth-least populous in the United States. Its county seat is Winnett. The county's area was partitioned from Fergus County in 1925 to become the last of Montana's 56 counties to be organized.
History