THE NASSAU COUNTY LAND BRIEF
Land in the
Long Island Sound Coastal Lowland setting.
Nassau County has 284.5 square miles of land in New York. 3 mapped landscape regions meet across Nassau County: Long Island Sound Coastal Lowland, Barrier Islands/Coastal Marshes, Cape Cod/Long Island.
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
Nassau County intersects 3 mapped regional units. The largest mapped shares are:
- Long Island Sound Coastal Lowland78.5%
- Barrier Islands/Coastal Marshes15.8%
- Cape Cod/Long Island5.7%
Atlantic Coastal Pine Barrens in Nassau County
Sandy coastal landscapes combine beaches, dunes, bays and marshes with oak-pine woodland. These pine-barrens settings form a transition between warmer southern coasts and rockier shores farther north.
Read the regional source ↗Finding your parcel within Nassau County
The atlas lists 136 cities, towns, townships, and Census communities associated with Nassau County, including Hempstead, Oyster Bay, North Hempstead. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Nassau County by land and water
The Census records 168.8 square miles of water within Nassau County, or 37.2% of its total area. That share is close to Nassau County’s 37.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Nassau County has 49.8 times the land area of nearby Uniondale CDP (5.71 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Bronx County, Queens County, Suffolk County, Westchester County within New York. A tract near one of these lines should be matched to the county identifier on its own records.

