Jefferson County, Montana

Jefferson County
County
Jefferson County Courthouse in Boulder
Location within the U.S. state of Montana
Montana's location within the U.S.
Coordinates: 46.18°N 112.11°W / 46.18; -112.11
Country	United States
State	Montana
Founded	February 2, 1865[1]
Named for	Thomas Jefferson
Seat	Boulder
Largest town	Clancy
Area
• Total	1,659 sq mi (4,300 km^2)
• Land	1,656 sq mi (4,290 km^2)
• Water	2.6 sq mi (7 km^2)  0.2%
Population  (2020)
• Total	12,085
• Density	7/sq mi (3/km^2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	2nd
Website	www.jeffersoncounty-mt.gov
Montana county number 51

Jefferson County is a county found in the U.S. state of Montana. As of the 2020 United States Census, there were 12,085 people.^[2] Its county seat is Boulder.^[3] The county was created in 1865^[4] and named after Thomas Jefferson,^[5] the 3rd President of the United States (1801–1809).

References

1. "Montana County Formation Table". genealogytrails.com. Retrieved April 3, 2018.
2. "QuickFacts: Jefferson County, Montana". United States Census Bureau. Retrieved January 4, 2024.
3. "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
4. "Montana Place Names Companion". Montana Place Names From Alzada to Zortman. Montana Historical Society Research Center. Retrieved December 1, 2014.
5. Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 168.