THE ALLEGANY COUNTY LAND BRIEF
Land in the
Glaciated Low Allegheny Plateau setting.
Allegany County has 1,029.5 square miles of land in New York. 4 mapped landscape regions meet across Allegany County: Glaciated Low Allegheny Plateau, Glaciated Allegheny Hills, Unglaciated High Allegheny Plateau, among others.
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
Allegany County intersects 4 mapped regional units. The largest mapped shares are:
- Glaciated Low Allegheny Plateau44.1%
- Glaciated Allegheny Hills43.3%
- Unglaciated High Allegheny Plateau11.8%
- Finger Lakes Uplands and Gorges0.8%
North Central Appalachians in Allegany County
Forest-covered plateau surfaces, high hills and low mountains are underlain by layered sedimentary rocks. Most of this region escaped continental glaciation, leaving deeply cut upland terrain.
Read the regional source ↗Finding your parcel within Allegany County
The atlas lists 46 cities, towns, townships, and Census communities associated with Allegany County, including Almond, Andover, Hume. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Allegany County by land and water
The Census records 5.02 square miles of water within Allegany County, or 0.5% of its total area. That share is close to Allegany County’s 0.5%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Allegany County has 29.9 times the land area of nearby Amity town (34.5 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Cattaraugus County, Livingston County, Steuben County, Wyoming County within New York. A tract near one of these lines should be matched to the county identifier on its own records.

