Lakes / Ohio
Ohio Lakes
352 lakes and counting - every figure from the Ohio DNR. The deepest natural lake counted so far is McKarns Lake at 75 ft.
352
Lakes Counted
13,356 acres
Largest - Grand Lake St. Marys
75 ft
Deepest Natural - McKarns Lake
Rankings
Featured Lake
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Grand Lake St. Marys | Mercer | 13,356 acres | 14 ft |
Lakes Near Cities
Browse by County
Adams County (2)Allen County (8)Ashland County (6)Ashtabula County (7)Athens County (5)Auglaize County (1)Belmont County (7)Brown County (3)Butler County (1)Carroll County (4)Champaign County (3)Clark County (3)Clermont County (4)Clinton County (2)Columbiana County (11)Coshocton County (2)Crawford County (6)Defiance County (3)Delaware County (5)Fairfield County (3)Fayette County (1)Franklin County (2)Fulton County (6)Gallia County (2)Geauga County (15)Greene County (2)Guernsey County (4)Hamilton County (3)Hancock County (10)Harrison County (2)Highland County (2)Hocking County (2)Holmes County (3)Huron County (10)Jackson County (5)Jefferson County (4)Knox County (4)Lake County (1)Lawrence County (2)Licking County (2)Logan County (3)Lorain County (4)Lucas County (3)Madison County (2)Mahoning County (11)Medina County (6)Meigs County (1)Mercer County (1)Miami County (1)Monroe County (1)Montgomery County (1)Morgan County (3)Morrow County (5)Muskingum County (5)Noble County (3)Paulding County (1)Perry County (6)Pickaway County (3)Pike County (2)Portage County (25)Preble County (3)Putnam County (2)Richland County (4)Ross County (4)Sandusky County (4)Scioto County (3)Seneca County (1)Shelby County (1)Stark County (8)Summit County (24)Trumbull County (5)Tuscarawas County (3)Van Wert County (4)Vinton County (3)Warren County (4)Washington County (5)Wayne County (4)Williams County (9)Wood County (1)Wyandot County (5)
Source: Ohio DNR lake data. Verified October 28, 2026.