Jefferson County

Also 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 )

~5 min read

Article

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.

On the map

Available in 45 languages

Connections

United States Census Bureau

Entity

Thomas Jefferson

Entity

Similar entities

Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).

Lewis and Clark County

Entitydist 0.24

Category:Jefferson County, Montana

Entitydist 0.25

Roosevelt County

Entitydist 0.25

Jefferson County

Key facts

Article

On the map

Available in 45 languages

Connections

What links here621 pages

Similar entities

Categories

Wikidata facts

Similar entities

What links here621 pages