THE WASHINGTON COUNTY LAND BRIEF
Land in the
Monongahela Transition Zone setting.
Washington County has 857 square miles of land in Pennsylvania. 3 mapped landscape regions meet across Washington County: Monongahela Transition Zone, Permian Hills, Pittsburgh Low Plateau.
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 3 mapped regional units. The largest mapped shares are:
- Monongahela Transition Zone64.4%
- Permian Hills31.5%
- Pittsburgh Low Plateau4.1%
Finding your parcel within Washington County
The atlas lists 103 cities, towns, townships, and Census communities associated with Washington County, including Hanover, Amwell, Donegal. 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 3.84 square miles of water within Washington County, or 0.4% of its total area. That share is close to Washington County’s 0.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Washington County has 969.5 times the land area of nearby Meadowlands CDP (0.88 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Allegheny County, Beaver County, Fayette County, Greene County, Westmoreland County within Pennsylvania. A tract near one of these lines should be matched to the county identifier on its own records.