THE HARMON COUNTY LAND BRIEF
Land in the
Red River Tablelands setting.
Harmon County has 537.3 square miles of land in Oklahoma. 3 mapped landscape regions meet across Harmon County: Red River Tablelands, Caprock Canyons, Badlands, and Breaks, Red Prairie.
These plains are lower and somewhat more irregular than the High Plains to the west. Their grassland setting includes rolling terrain and a transition toward greater rainfall in the east.
Regional context: Central Great Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Harmon County intersects 3 mapped regional units. The largest mapped shares are:
- Red River Tablelands57.4%
- Caprock Canyons, Badlands, and Breaks25.2%
- Red Prairie17.4%
Southwestern Tablelands in Harmon County
Canyons, mesas, badlands and river breaks border the High Plains. This more dissected country includes grassland and shrub-covered slopes, with sharper terrain changes than the neighboring plains.
Read the regional source ↗Finding your parcel within Harmon County
The atlas lists 2 cities, towns, townships, and Census communities associated with Harmon County, including Hollis, Gould. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Harmon County by land and water
The Census records 1.47 square miles of water within Harmon County, or 0.3% of its total area. That share is close to Harmon County’s 0.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Harmon County has 361.8 times the land area of nearby Hollis city (1.49 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Beckham County, Greer County, Jackson County within Oklahoma. A tract near one of these lines should be matched to the county identifier on its own records.

