THE WESTCHESTER COUNTY LAND BRIEF
Land in the
Southern New England Coastal Plains and Hills setting.
Westchester County has 430.8 square miles of land in New York. 4 mapped landscape regions meet across Westchester County: Southern New England Coastal Plains and Hills, Long Island Sound Coastal Lowland, Glaciated Reading Prong/Hudson Highlands, among others.
Irregular plains and low hills form a coastal transition with glacial lakes and oak-pine woodland. This northeastern landscape is gentler than the mountainous country farther inland.
Regional context: Northeastern Coastal Zone ↗ · Regional mapping across the county footprint
Where the landscape changes
Westchester County intersects 4 mapped regional units. The largest mapped shares are:
- Southern New England Coastal Plains and Hills88.4%
- Long Island Sound Coastal Lowland10%
- Glaciated Reading Prong/Hudson Highlands1.3%
- Glaciated Triassic Lowlands0.3%
Northeastern Highlands in Westchester County
Forested hills and mountains span northern New England, the Adirondacks and higher Catskills. Glacial lakes and steep streams accompany a transition between northern hardwood and spruce-fir forests.
Read the regional source ↗Northern Piedmont in Westchester County
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.
Read the regional source ↗Finding your parcel within Westchester County
The atlas lists 72 cities, towns, townships, and Census communities associated with Westchester County, including Cortlandt, Bedford, Yorktown. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Westchester County by land and water
The Census records 69.3 square miles of water within Westchester County, or 13.9% of its total area. That share is close to Westchester County’s 13.9%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Westchester County has 475.5 times the land area of nearby Chappaqua CDP (0.91 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Bronx County, Nassau County, Putnam County, Rockland County within New York. A tract near one of these lines should be matched to the county identifier on its own records.

