Lakes / New Hampshire / Coos County / Back Lake
Back Lake, New Hampshire
347.43 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Hampshire
45.08 degrees N, 71.35 degrees W - Coos 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 Back Lake Stacks Up
- Larger than 89% of the 516 lakes counted in New Hampshire.
- About 107 miles from Laconia, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Francis | Coos | 2.8 mi | 1,933.85 acres |
| First Connecticut Lake | Coos | 5.1 mi | 3,071.1 acres |
| Round Pond | Coos | 5.3 mi | 59.06 acres |
| Big Brook Bog | Coos | 8.3 mi | 36.08 acres |
| Diamond Pond | Coos | 9.0 mi | 181.13 acres |
| Little Diamond Pond | Coos | 9.4 mi | 60.29 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Back Lake
How Big Is Back Lake?
Back Lake covers 347.43 acres in Coos County, New Hampshire.
What Is the Largest Lake in Coos County?
Umbagog Lake is the largest lake in Coos County, at 7,642.5 acres.
Largest Lakes in New Hampshire
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Winnipesaukee | Belknap | 45,654.45 acres | - |
| 2 | Umbagog Lake | Coos | 7,642.5 acres | - |
| 3 | Squam Lake | Belknap | 6,791.2 acres | - |
| 4 | Newfound Lake | Grafton | 4,451.11 acres | - |
| 5 | Lake Winnisquam | Belknap | 4,213.89 acres | - |
All 516 New Hampshire lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 91153053). Verified October 30, 2026.