THE BALTIMORE COUNTY LAND BRIEF
Land in the
Piedmont Uplands setting.
Baltimore County has 598.4 square miles of land in Maryland. 3 mapped landscape regions meet across Baltimore County: Piedmont Uplands, Chesapeake Rolling Coastal Plain, Chesapeake-Pamlico Lowlands and Tidal Marshes.
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
Baltimore County intersects 3 mapped regional units. The largest mapped shares are:
- Piedmont Uplands81.5%
- Chesapeake Rolling Coastal Plain9.4%
- Chesapeake-Pamlico Lowlands and Tidal Marshes9.1%
Southeastern Plains in Baltimore County
Irregular plains of sand, silt and clay support a mix of pine and hardwood landscapes. The region has more relief than the lower coastal plain, with generally gentle stream gradients.
Read the regional source ↗Middle Atlantic Coastal Plain in Baltimore County
Low coastal plains contain terraces, estuaries, marshes and barrier islands. Unconsolidated sediments underlie this varied coastal setting, with forest patterns changing near streams and low-lying areas.
Read the regional source ↗Finding your parcel within Baltimore County
The atlas lists 32 cities, towns, townships, and Census communities associated with Baltimore County, including Towson, Catonsville, Dundalk. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Baltimore County by land and water
The Census records 83.4 square miles of water within Baltimore County, or 12.2% of its total area. That share is close to Baltimore County’s 12.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Baltimore County has 104.6 times the land area of nearby Timonium CDP (5.72 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Anne Arundel County, Baltimore city, Carroll County, Harford County, Howard County, Kent County within Maryland. A tract near one of these lines should be matched to the county identifier on its own records.

