Jefferson County
Sign in to saveAlso known as Jefferson County, Montana, Jefferson County, MT
county in Montana, United States
Key facts
- Country
- United States
- State
- Montana
- Founded
- February 2, 1865
- Named after
- Thomas Jefferson
- Seat
- Boulder
- Largest town
- Clancy
- Total
- 1,659 sq mi (4,300 km )
- Land
- 1,656 sq mi (4,290 km )
- Water
- 2.6 sq mi (6.7 km ) 0.2%
- Estimate 2025
- 13,329
- Density
- 7/sq mi (2.7/km )
- Time zone
- UTC−7 ( Mountain )
- Summer dst
- UTC−6 ( MDT )
- Congressional district
- 2nd
- Website
- www .jeffersoncounty-mt .gov
via Wikipedia infobox
Wikidata facts
- Named after
- Thomas Jefferson
- Country
- United States
- Located in
- Montana
- Contains
- Boulder
- Capital
- Boulder
- Population
- 12085
- Area
- 4296
- Shares border with
- Gallatin County
- Official website
- www.jeffersoncounty-mt.gov
- Image
- Jeffersoncourthouse.jpg
- Households
- 4445
Show 6 more facts
- topic's main category
- Category:Jefferson County, Montana
- Commons category
- Jefferson County, Montana
- inception
- 1865-02-02
- water as percent of area
- 0.2
- native label
- Jefferson County
- per capita income
- 33716
Sources (10)
via Wikidata · CC0
~5 min read
Encyclopedic overview
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.
Excerpted from Wikipedia’s “Jefferson County” article, available under the CC BY-SA 4.0 licence.