Lakes / New Jersey / Sussex County / Jefferson Lake
Jefferson Lake, New Jersey
46.46 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
40.93 degrees N, 74.74 degrees W - Sussex County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Jefferson Lake Stacks Up
- Larger than 43% of the 295 lakes counted in New Jersey.
- About 16 miles from Morristown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Cranberry Lake | Sussex | 1.6 mi | 192.61 acres |
| Frenches Pond | Sussex | 1.9 mi | 32.37 acres |
| Lake Musconetcong | Morris | 2.6 mi | 315.09 acres |
| Lake Lackawanna | Sussex | 2.6 mi | 115.28 acres |
| Johnson Lake | Sussex | 2.7 mi | 36.82 acres |
| Cub Lake | Sussex | 2.8 mi | 43.27 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Jefferson Lake
How Big Is Jefferson Lake?
Jefferson Lake covers 46.46 acres in Sussex County, New Jersey.
What Is the Largest Lake in Sussex County?
Lake Hopatcong is the largest lake in Sussex County, at 2,493.66 acres.
Largest Lakes in New Jersey
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Hopatcong | Sussex | 2,493.66 acres | - |
| 2 | Round Valley Reservoir | Hunterdon | 2,272.23 acres | - |
| 3 | Wanaque Reservoir | Passaic | 1,971.09 acres | - |
| 4 | Van Sciver Lake | Burlington | 1,396.61 acres | - |
| 5 | Spruce Run Reservoir | Hunterdon | 1,354.88 acres | - |
All 295 New Jersey lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 26057880). Verified October 30, 2026.