THE OSWEGO COUNTY LAND BRIEF
Land in the
Ontario Lowlands setting.
Oswego County has 951.6 square miles of land in New York. 3 mapped landscape regions meet across Oswego County: Ontario Lowlands, Tug Hill Plateau, Tug Hill Transition.
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.
Regional context: Eastern Great Lakes Lowlands ↗ · Regional mapping across the county footprint
Where the landscape changes
Oswego County intersects 3 mapped regional units. The largest mapped shares are:
- Ontario Lowlands77.9%
- Tug Hill Plateau14.3%
- Tug Hill Transition7.8%
Northeastern Highlands in Oswego 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 ↗Finding your parcel within Oswego County
The atlas lists 39 cities, towns, townships, and Census communities associated with Oswego County, including Redfield, Richland, Constantia. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Oswego County by land and water
The Census records 360.4 square miles of water within Oswego County, or 27.5% of its total area. That share is close to Oswego County’s 27.5%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Oswego County has 20.6 times the land area of nearby Mexico town (46.3 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Cayuga County, Jefferson County, Lewis County, Madison County, Oneida County, Onondaga County within New York. A tract near one of these lines should be matched to the county identifier on its own records.

