THE BLAINE COUNTY LAND BRIEF
Land in the
Foothill Shrublands-Grasslands setting.
Blaine County has 2,637.7 square miles of land in Idaho. 10 mapped landscape regions meet across Blaine County: Foothill Shrublands-Grasslands, Eastern Snake River Basalt Plains, Dry Partly Wooded Mountains, among others.
A deeply cut mountainous plateau forms the Idaho Batholith. Granitic terrain supports conifer forests, while deep canyons introduce warmer settings with pine, shrubs and grasses.
Regional context: Idaho Batholith ↗ · Regional mapping across the county footprint
Where the landscape changes
Blaine County intersects 10 mapped regional units. The largest mapped shares are:
- Foothill Shrublands-Grasslands22%
- Eastern Snake River Basalt Plains20.3%
- Dry Partly Wooded Mountains16.6%
- Lava Fields14.8%
- Southern Forested Mountains8.8%
Snake River Plain in Blaine 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 ↗Finding your parcel within Blaine County
The atlas lists 6 cities, towns, townships, and Census communities associated with Blaine County, including Sun Valley, Hailey, Carey. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Blaine County by land and water
The Census records 17.2 square miles of water within Blaine County, or 0.6% of its total area. That share is close to Blaine County’s 0.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Blaine County has 764.6 times the land area of nearby Carey city (3.45 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Bingham County, Butte County, Camas County, Cassia County, Custer County, Elmore County, Lincoln County, Minidoka County and other counties within Idaho. A tract near one of these lines should be matched to the county identifier on its own records.

