Lakes in Coos County, New Hampshire

46 lakes counted in Coos County - the largest is Umbagog Lake at 7,642.5 acres.

Lakes Counted

7,642.5 acres

Largest - Umbagog Lake

Coos County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.

All Counted Lakes

#	Lake	County	Surface Area	Max Depth
1	Umbagog Lake	Coos	7,642.5 acres	-
2	First Connecticut Lake	Coos	3,071.1 acres	-
3	Lake Francis	Coos	1,933.85 acres	-
4	Second Connecticut Lake	Coos	1,102.09 acres	-
5	Back Lake	Coos	347.43 acres	-
6	Success Pond	Coos	281.95 acres	-
7	Akers Pond	Coos	276.26 acres	-
8	Greenough Pond	Coos	234.01 acres	-
9	Third Connecticut Lake	Coos	230.8 acres	-
10	Pontook Reservoir	Coos	202.53 acres	-
11	Christine Lake	Coos	196.7 acres	-
12	Forest Lake	Coos	196.2 acres	-
13	Diamond Pond	Coos	181.13 acres	-
14	Millsfield Pond	Coos	165.31 acres	-
15	South Ponds	Coos	131.91 acres	-
16	Burns Pond	Coos	128 acres	-
17	Martin Meadow Pond	Coos	128 acres	-
18	Jericho Lake	Coos	126.54 acres	-
19	Cherry Pond	Coos	120.83 acres	-
20	Dummer Ponds	Coos	114.16 acres	-
21	Sweat Meadows	Coos	102.8 acres	-
22	East Inlet Flowage	Coos	91.92 acres	-
23	Head Pond	Coos	89.7 acres	-
24	Scott Bog	Coos	88.22 acres	-
25	Cedar Pond	Coos	79.82 acres	-
26	Phillips Pond	Coos	71.41 acres	-
27	Trio Ponds	Coos	68.97 acres	-
28	Little Diamond Pond	Coos	60.29 acres	-
29	Round Pond	Coos	59.06 acres	-
30	Reflection Pond	Coos	56.34 acres	-
31	Mirror Lake	Coos	54.36 acres	-
32	Nay Pond	Coos	50.16 acres	-
33	Munn Pond	Coos	45.22 acres	-
34	Little Greenough Pond	Coos	41.51 acres	-
35	Round Pond Lake	Coos	41.51 acres	-
36	Sessions Pond	Coos	40.77 acres	-
37	Mud Pond	Coos	40.03 acres	-
38	Basin Brook Reservoir	Coos	39.54 acres	-
39	Fish Pond	Coos	38.8 acres	-
40	Big Brook Bog	Coos	36.08 acres	-
41	Little Bog Pond	Coos	34.1 acres	-
42	Long Pond	Coos	32.87 acres	-
43	Stratford Bog Pond	Coos	32.87 acres	-
44	Moose Pond	Coos	29.16 acres	-
45	Long Pond	Coos	27.92 acres	-
46	Lake Gloriette	Coos	25.7 acres	-

Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.