THE FREDERICK COUNTY LAND BRIEF
Land in the
Piedmont Uplands setting.
Frederick County has 660.6 square miles of land in Maryland. 6 mapped landscape regions meet across Frederick County: Piedmont Uplands, Triassic Lowlands, Northern Igneous Ridges, among others.
Rounded low hills, open valleys and irregular plains form a transition between Appalachian highlands and the coastal plain. The underlying geology mixes metamorphic, igneous and sedimentary rocks.
Regional context: Northern Piedmont ↗ · Regional mapping across the county footprint
Where the landscape changes
Frederick County intersects 6 mapped regional units. The largest mapped shares are:
- Piedmont Uplands44.3%
- Triassic Lowlands21.6%
- Northern Igneous Ridges13%
- Piedmont Limestone/Dolomite Lowlands10.8%
- Northern Sedimentary and Metasedimentary Ridges10%
Blue Ridge in Frederick 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 Frederick County
The atlas lists 28 cities, towns, townships, and Census communities associated with Frederick County, including Frederick, Green Valley, Ballenger Creek. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Frederick County by land and water
The Census records 6.81 square miles of water within Frederick County, or 1% of its total area. That share is close to Frederick County’s 1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Frederick County has 138.7 times the land area of nearby Walkersville town (4.76 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Carroll County, Howard County, Montgomery County, Washington County within Maryland. A tract near one of these lines should be matched to the county identifier on its own records.

