THE UNION COUNTY LAND BRIEF
Land in the
Northern Shale Valleys setting.
Union County has 316 square miles of land in Pennsylvania. 3 mapped landscape regions meet across Union County: Northern Shale Valleys, Northern Sandstone Ridges, Northern Limestone/Dolomite Valleys.
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
Union County intersects 3 mapped regional units. The largest mapped shares are:
- Northern Shale Valleys40.9%
- Northern Sandstone Ridges40%
- Northern Limestone/Dolomite Valleys19%
Finding your parcel within Union County
The atlas lists 21 cities, towns, townships, and Census communities associated with Union County, including Hartley, White Deer, Lewis. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Union County by land and water
The Census records 1.78 square miles of water within Union County, or 0.6% of its total area. That share is close to Union County’s 0.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Union County has 175.1 times the land area of nearby Mifflinburg borough (1.8 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Centre County, Clinton County, Lycoming County, Mifflin County, Northumberland County, Snyder County within Pennsylvania. A tract near one of these lines should be matched to the county identifier on its own records.