Petroleum County | |
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Coordinates: 47°07′N 108°16′W / 47.11°N 108.26°W | |
Country | United States |
State | Montana |
Founded | February 25, 1925 |
Named for | Petroleum fields |
Seat | Winnett |
Largest town | Winnett |
Area | |
• Total | 1,674 sq mi (4,340 km2) |
• Land | 1,655 sq mi (4,290 km2) |
• Water | 19 sq mi (50 km2) 1.1% |
Population (2020) | |
• Total | 496 |
• Estimate (2022) | 524 |
• Density | 0.30/sq mi (0.11/km2) |
Time zone | UTC−7 (Mountain) |
• Summer (DST) | UTC−6 (MDT) |
Congressional district | 2nd |
Website | petroleumcountymt |
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Petroleum County is a county in the U.S. state of Montana. As of the 2020 census, the population was 496,[1] making it the least populous county in Montana and the eighth-least populous in the United States.[2] Its county seat is Winnett.[3] The county's area was partitioned from Fergus County in 1925 to become the last of Montana's 56 counties to be organized.[4][5]