THE BONNEVILLE COUNTY LAND BRIEF
Land in the
Partly Forested Mountains setting.
Bonneville County has 1,866 square miles of land in Idaho. 9 mapped landscape regions meet across Bonneville County: Partly Forested Mountains, Dissected Plateaus and Teton Basin, Eastern Snake River Basalt Plains, 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
Bonneville County intersects 9 mapped regional units. The largest mapped shares are:
- Partly Forested Mountains47.4%
- Dissected Plateaus and Teton Basin13.5%
- Eastern Snake River Basalt Plains11.2%
- High Elevation Valleys10.3%
- Upper Snake River Plain8%
Snake River Plain in Bonneville County
The Snake River Plain is lower and gentler than its surrounding mountains. Alluvial valleys, sagebrush-covered plains, low hills and scattered lava fields form its principal landscape patterns.
Read the regional source ↗Northern Basin and Range in Bonneville County
Lava plains, stony uplands, dry valleys and scattered ranges form the Northern Basin and Range. Sagebrush and grassland give way to juniper and other woodland in higher or rockier settings.
Read the regional source ↗Finding your parcel within Bonneville County
The atlas lists 8 cities, towns, townships, and Census communities associated with Bonneville County, including Idaho Falls, Swan Valley, Ammon. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Bonneville County by land and water
The Census records 34.3 square miles of water within Bonneville County, or 1.8% of its total area. That share is close to Bonneville County’s 1.8%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Bonneville County has 160.7 times the land area of nearby Swan Valley city (11.6 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Bingham County, Caribou County, Jefferson County, Madison County, Teton County within Idaho. A tract near one of these lines should be matched to the county identifier on its own records.

