THE GALLATIN COUNTY LAND BRIEF
Land in the
Townsend Basin setting.
Gallatin County has 2,605.4 square miles of land in Montana. 9 mapped landscape regions meet across Gallatin County: Townsend Basin, Mid-elevation Sedimentary Mountains, Gneissic-Schistose Forested Mountains, 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
Gallatin County intersects 9 mapped regional units. The largest mapped shares are:
- Townsend Basin34.1%
- Mid-elevation Sedimentary Mountains27.6%
- Gneissic-Schistose Forested Mountains10.9%
- Absaroka-Gallatin Volcanic Mountains8.1%
- Yellowstone Plateau7.7%
Northwestern Great Plains in Gallatin County
Rolling semiarid plains are punctuated by buttes, badlands and river breaks. Much of the regional terrain developed on sandstone, siltstone and shale without the leveling influence of continental glaciers.
Read the regional source ↗Finding your parcel within Gallatin County
The atlas lists 19 cities, towns, townships, and Census communities associated with Gallatin County, including Big Sky, Sedan, Ponderosa Pines. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Gallatin County by land and water
The Census records 28.4 square miles of water within Gallatin County, or 1.1% of its total area. That share is close to Gallatin County’s 1.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Gallatin County has 445.4 times the land area of nearby Gallatin Gateway CDP (5.85 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Broadwater County, Jefferson County, Madison County, Meagher County, Park County within Montana. A tract near one of these lines should be matched to the county identifier on its own records.

