THE WARREN COUNTY LAND BRIEF
Land in the
Northern Limestone/Dolomite Valleys setting.
Warren County has 356.5 square miles of land in New Jersey. 8 mapped landscape regions meet across Warren County: Northern Limestone/Dolomite Valleys, Northern Glaciated Limestone Valleys, Reading Prong, among others.
Long, roughly parallel ridges and valleys follow folded and faulted rock layers. Limestone valleys, sandstone ridges and other geologic contrasts produce varied terrain and numerous regional springs and caves.
Regional context: Ridge and Valley ↗ · Regional mapping across the county footprint
Where the landscape changes
Warren County intersects 8 mapped regional units. The largest mapped shares are:
- Northern Limestone/Dolomite Valleys23.9%
- Northern Glaciated Limestone Valleys20.3%
- Reading Prong18.5%
- Northern Glaciated Shale and Slate Valleys13.6%
- Northern Glaciated Ridges10.8%
Northeastern Highlands in Warren 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 Warren County
The atlas lists 58 cities, towns, townships, and Census communities associated with Warren County, including Hardwick, Blairstown, Mansfield. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Warren County by land and water
The Census records 6.11 square miles of water within Warren County, or 1.7% of its total area. That share is close to Warren County’s 1.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Warren County has 316.6 times the land area of nearby Mountain Lake CDP (1.13 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Hunterdon County, Morris County, Sussex County within New Jersey. A tract near one of these lines should be matched to the county identifier on its own records.

