THE JOHNSON COUNTY LAND BRIEF
Land in the
Powder River Basin setting.
Johnson County has 4,154.2 square miles of land in Wyoming. 9 mapped landscape regions meet across Johnson County: Powder River Basin, Foothill Shrublands and Low Mountains, Granitic Subalpine Zone, among others.
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.
Regional context: Northwestern Great Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Johnson County intersects 9 mapped regional units. The largest mapped shares are:
- Powder River Basin55.7%
- Foothill Shrublands and Low Mountains10.5%
- Granitic Subalpine Zone8.9%
- Dry Mid-elevation Sedimentary Mountains7.8%
- Casper Arch7%
Wyoming Basin in Johnson County
A broad dry basin is interrupted by hills and low mountains. Grassland and shrubland dominate the regional setting between the more heavily forested surrounding ranges.
Read the regional source ↗Middle Rockies in Johnson County
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.
Read the regional source ↗Finding your parcel within Johnson County
The atlas lists 2 cities, towns, townships, and Census communities associated with Johnson County, including Buffalo, Kaycee. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Johnson County by land and water
The Census records 20.4 square miles of water within Johnson County, or 0.5% of its total area. That share is close to Johnson County’s 0.5%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Johnson County has 895.3 times the land area of nearby Buffalo city (4.64 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Big Horn County, Campbell County, Converse County, Natrona County, Sheridan County, Washakie County within Wyoming. A tract near one of these lines should be matched to the county identifier on its own records.

