THE JEFFERSON COUNTY LAND BRIEF
Land in the
Elkhorn Mountains-Boulder Batholith setting.
Jefferson County has 1,657 square miles of land in Montana. 4 mapped landscape regions meet across Jefferson County: Elkhorn Mountains-Boulder Batholith, Townsend Basin, Townsend-Horseshoe-London Sedimentary Hills, among others.
Forested mountain ranges rise above grassy or shrubby intermountain valleys. The Middle Rockies combine alpine high country, partly wooded foothills and valleys supplied by mountain streams.
Regional context: Middle Rockies ↗ · Regional mapping across the county footprint
Where the landscape changes
Jefferson County intersects 4 mapped regional units. The largest mapped shares are:
- Elkhorn Mountains-Boulder Batholith55.1%
- Townsend Basin32.4%
- Townsend-Horseshoe-London Sedimentary Hills7.7%
- Eastern Divide Mountains4.9%
Finding your parcel within Jefferson County
The atlas lists 10 cities, towns, townships, and Census communities associated with Jefferson County, including Clancy, Montana City, Jefferson City. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Jefferson County by land and water
The Census records 2.42 square miles of water within Jefferson County, or 0.1% of its total area. That share is close to Jefferson County’s 0.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Jefferson County has 1,474.2 times the land area of nearby Boulder city (1.12 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Broadwater County, Deer Lodge County, Gallatin County, Lewis and Clark County, Madison County, Powell County, Silver Bow County within Montana. A tract near one of these lines should be matched to the county identifier on its own records.

