THE WASHINGTON COUNTY LAND BRIEF
Land in the
Southern Limestone/Dolomite Valleys and Low Rolling Hills setting.
Washington County has 326.5 square miles of land in Tennessee. 5 mapped landscape regions meet across Washington County: Southern Limestone/Dolomite Valleys and Low Rolling Hills, Southern Sedimentary Ridges, Southern Shale Valleys, among others.
Long, roughly parallel ridges and valleys follow folded and faulted rock layers. Limestone valleys, sandstone ridges and other geologic contrasts produce varied terrain and numerous regional springs and caves.
Regional context: Ridge and Valley ↗ · Regional mapping across the county footprint
Where the landscape changes
Washington County intersects 5 mapped regional units. The largest mapped shares are:
- Southern Limestone/Dolomite Valleys and Low Rolling Hills83.9%
- Southern Sedimentary Ridges11.3%
- Southern Shale Valleys3.9%
- Southern Dissected Ridges and Knobs0.5%
- Limestone Valleys and Coves0.3%
Blue Ridge in Washington County
Forested ridges, plateaus and high mountains extend through the Blue Ridge. Elevation, rainfall and sheltered coves create marked differences in forest communities across short distances.
Read the regional source ↗Finding your parcel within Washington County
The atlas lists 9 cities, towns, townships, and Census communities associated with Washington County, including Johnson City, Jonesborough, Oak Grove. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Washington County by land and water
The Census records 3.28 square miles of water within Washington County, or 1% of its total area. That share is close to Washington County’s 1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Washington County has 59.8 times the land area of nearby Jonesborough town (5.46 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Carter County, Greene County, Hawkins County, Sullivan County, Unicoi County within Tennessee. A tract near one of these lines should be matched to the county identifier on its own records.

