Lakes / New Jersey / Passaic County / Lake Iosco
Lake Iosco, New Jersey
67.46 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
41.03 degrees N, 74.32 degrees W - Passaic 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 Lake Iosco Stacks Up
- Larger than 59% of the 295 lakes counted in New Jersey.
- About 18 miles from Morristown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Glen Wild Lake | Passaic | 0.6 mi | 110.46 acres |
| Lake Kampfe | Passaic | 1.3 mi | 32.12 acres |
| Bear Swamp Lake | Passaic | 2.3 mi | 51.15 acres |
| Henion Pond | Passaic | 2.3 mi | 39.78 acres |
| High Crest Lake | Morris | 2.8 mi | 39.04 acres |
| Pompton Lake | Passaic | 2.9 mi | 185.08 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Iosco
How Big Is Lake Iosco?
Lake Iosco covers 67.46 acres in Passaic County, New Jersey.
What Is the Largest Lake in Passaic County?
Wanaque Reservoir is the largest lake in Passaic County, at 1,971.09 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 60462553). Verified October 30, 2026.