Lakes / New Jersey / Cumberland County / Union Lake
Union Lake, New Jersey
865.19 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
39.42 degrees N, 75.06 degrees W - Cumberland 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 Union Lake Stacks Up
- Ranks #7 for surface area among the New Jersey lakes counted so far - 865.19 acres.
- The largest lake in Cumberland County among those counted.
- About 34 miles from Atlantic City, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Beaver Lake | Cumberland | 5.5 mi | 35.83 acres |
| Rainbow Lake | Salem | 5.9 mi | 75.93 acres |
| Laurel Lake | Cumberland | 5.9 mi | 143.68 acres |
| Cumberland Pond | Cumberland | 7.0 mi | 32.62 acres |
| Parvin Lake | Salem | 7.5 mi | 91.88 acres |
| Clarks Pond | Cumberland | 7.7 mi | 44.97 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Union Lake
How Big Is Union Lake?
Union Lake covers 865.19 acres in Cumberland County, New Jersey.
What Is the Largest Lake in Cumberland County?
Union Lake is the largest lake in Cumberland County, at 865.19 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 29849205). Verified October 30, 2026.