THE WASHINGTON COUNTY LAND BRIEF
Land in the
Permian Hills setting.
Washington County has 632.2 square miles of land in Ohio. 2 mapped landscape regions meet across Washington County: Permian Hills, Monongahela Transition Zone.
Rounded wooded hills and intervening valleys form an unglaciated plateau landscape. Valley floors contain much of the region's open land, contrasting with its more forested slopes.
Regional context: Western Allegheny Plateau ↗ · Regional mapping across the county footprint
Where the landscape changes
Washington County intersects 2 mapped regional units. The largest mapped shares are:
- Permian Hills91.6%
- Monongahela Transition Zone8.4%
Finding your parcel within Washington County
The atlas lists 35 cities, towns, townships, and Census communities associated with Washington County, including Warren, Waterford, Watertown. 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 7.98 square miles of water within Washington County, or 1.2% of its total area. That share is close to Washington County’s 1.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Washington County has 123.1 times the land area of nearby Devola CDP (5.14 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Athens County, Monroe County, Morgan County, Noble County within Ohio. A tract near one of these lines should be matched to the county identifier on its own records.

