THE JOHNSON COUNTY LAND BRIEF
Land in the
Lower Boston Mountains setting.
Johnson County has 661 square miles of land in Arkansas. 5 mapped landscape regions meet across Johnson County: Lower Boston Mountains, Arkansas Valley Hills, Arkansas Valley Plains, among others.
A deeply eroded sandstone-and-shale plateau creates the Boston Mountains' rugged valleys and uplands. Oak and hickory forests are prominent, with pine and cedar in some lower or exposed settings.
Regional context: Boston Mountains ↗ · Regional mapping across the county footprint
Where the landscape changes
Johnson County intersects 5 mapped regional units. The largest mapped shares are:
- Lower Boston Mountains52%
- Arkansas Valley Hills34.5%
- Arkansas Valley Plains8.7%
- Arkansas River Floodplain3.1%
- Upper Boston Mountains1.7%
Arkansas Valley in Johnson County
The Arkansas Valley mixes forested ridges with broader valleys. Its terrain is less rugged than the Boston and Ouachita mountains that border it, but more varied than neighboring plains.
Read the regional source ↗Finding your parcel within Johnson County
The atlas lists 8 cities, towns, townships, and Census communities associated with Johnson County, including Clarksville, Lamar, Hagarville. 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 23 square miles of water within Johnson County, or 3.4% of its total area. That share is close to Johnson County’s 3.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Johnson County has 784.1 times the land area of nearby Ozone CDP (0.84 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Franklin County, Logan County, Madison County, Newton County, Pope County within Arkansas. A tract near one of these lines should be matched to the county identifier on its own records.

