THE TOMPKINS COUNTY LAND BRIEF
Land in the
Finger Lakes Uplands and Gorges setting.
Tompkins County has 474.7 square miles of land in New York. 3 mapped landscape regions meet across Tompkins County: Finger Lakes Uplands and Gorges, Glaciated Low Allegheny Plateau, Ontario Lowlands.
Rolling hills, broad valleys and low mountains are mantled by glacial deposits. Sandstone, shale and siltstone underlie a mix of open land and woodland across the northern plateau.
Regional context: Northern Allegheny Plateau ↗ · Regional mapping across the county footprint
Where the landscape changes
Tompkins County intersects 3 mapped regional units. The largest mapped shares are:
- Finger Lakes Uplands and Gorges77%
- Glaciated Low Allegheny Plateau22.5%
- Ontario Lowlands0.5%
Eastern Great Lakes Lowlands in Tompkins County
Glacially shaped lowlands and irregular plains border the Great Lakes and adjacent hills. The lakes influence regional weather, while local landforms reflect both glacial deposits and former shorelines.
Read the regional source ↗Finding your parcel within Tompkins County
The atlas lists 30 cities, towns, townships, and Census communities associated with Tompkins County, including Dryden, Lansing, Newfield. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Tompkins County by land and water
The Census records 16.9 square miles of water within Tompkins County, or 3.4% of its total area. That share is close to Tompkins County’s 3.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Tompkins County has 2,109.6 times the land area of nearby Forest Home CDP (0.23 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Cayuga County, Chemung County, Cortland County, Schuyler County, Seneca County, Tioga County within New York. A tract near one of these lines should be matched to the county identifier on its own records.

