THE FRANKLIN COUNTY LAND BRIEF
Land in the
Northern Shale Valleys setting.
Franklin County has 772.3 square miles of land in Pennsylvania. 5 mapped landscape regions meet across Franklin County: Northern Shale Valleys, Northern Limestone/Dolomite Valleys, Northern Sandstone Ridges, 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
Franklin County intersects 5 mapped regional units. The largest mapped shares are:
- Northern Shale Valleys34.5%
- Northern Limestone/Dolomite Valleys33.2%
- Northern Sandstone Ridges23.2%
- Northern Sedimentary and Metasedimentary Ridges8%
- Northern Igneous Ridges1.1%
Blue Ridge in Franklin 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 Franklin County
The atlas lists 32 cities, towns, townships, and Census communities associated with Franklin County, including Letterkenny, Antrim, Fannett. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Franklin County by land and water
The Census records 0.6 square miles of water within Franklin County, or 0.1% of its total area. That share is close to Franklin County’s 0.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Franklin County has 21.7 times the land area of nearby Hamilton township (35.5 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Adams County, Cumberland County, Fulton County, Huntingdon County, Juniata County, Perry County within Pennsylvania. A tract near one of these lines should be matched to the county identifier on its own records.

