Jefferson County, Montana
Jefferson County | |
|---|---|
Jefferson County Courthouse in Boulder | |
Location within the U.S. state of Montana | |
Montana's location within the U.S. | |
| Coordinates: 46°11′N 112°07′W / 46.18°N 112.11°W | |
| Country | United States |
| State | Montana |
| Founded | February 2, 1865 |
| Named after | Thomas Jefferson |
| Seat | Boulder |
| Largest town | Clancy |
| Area | |
• Total | 1,659 sq mi (4,300 km2) |
| • Land | 1,656 sq mi (4,290 km2) |
| • Water | 2.6 sq mi (7 km2) 0.2% |
| Population (2020) | |
• Total | 12,085 |
• Estimate (2024) | 13,304 |
| • Density | 7/sq mi (3/km2) |
| Time zone | UTC−7 (Mountain) |
| • Summer (DST) | UTC−6 (MDT) |
| Congressional district | 2nd |
| Website | www |
| |
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Jefferson County is a county in Montana, United States. As of the 2020 census, the population was 12,085. Its county seat is Boulder. The county was created in 1865 and named for President Thomas Jefferson.
Jefferson County is part of the Helena, MT Micropolitan Statistical Area.