| Name | County | Size | Established | Features |
|---|---|---|---|---|
| Acadia Cliffs | Washington | 113 acres | 1994 | 🌳 🪨 🐦 |
| Adams Lake Prairie | Adams | 26 acres | 🌳 🦬 🌻 🐦 | |
| Audubon Islands | Lucas | 170 acres | 🐦 | |
| Aurora Sanctuary | Portage | 164 acres | 1999 | 🌳 🐊 🌷 🐦 |
| Baker Woods | Mercer | 47 acres | 1992 | 🌳 🐊 🌷 🐦 |
| Bigelow Cemetery | Madison | 0.5 acres | 1978 | 🦬 🌻 |
| Blackhand Gorge | Licking | 965 acres | 1975 | 🌳 🐊 🌷 🪨 🐦 |
| Boch Hollow | Hocking | 607 acres | 2008 | 🌳 🐊 🌷 🌻 🪨 🐦 |
| Boord | Washington | 127 acres | 1986 | 🌳 🪨 🐦 |
| Brown's Lake Bog | Wayne | 99 acres | 1966 | 🌳 🐊 🐦 🪨 |
| Burton | Geauga | 277 acres | 1999 | 🌳 🐊 🐦 🪨 |
| Caesar Creek Gorge | Warren | 484 acres | 🌳 🌷 🐦 🪨 | |
| Louis W. Campbell | Lucas | 211 acres | 🌳 🐊 🦬 🌻 🪨 | |
| Cedar Bog | Champaign | 428 acres | 1977 | 🦬 🐊 🌷 🌻 🪨 🐦 |
| Chaparral Prairie | Adams | 130 acres | 🌳 🦬 🌻 🐦 | |
| Christmas Rocks | Fairfield | 554 acres | 1973 | 🌳 🐊 🌷 🐦 🪨 |
| Clear Creek | Fairfield | 4,769 acres | 🌳 🐊 🌷 🌻 🐦 🪨 | |
| Clear Fork Gorge | Ashland | 29 acres | 1997 | 🌳 🪨 🐦 |
| Clifton Gorge | Greene | 268 acres268 acres | 1973 | 🌳 🌷 🌻 🐦 🪨 |
| Collier (Howard) | Seneca | 155 acres | 🌳 🐊 🌷 🐦 | |
| Conkles Hollow | Hocking | 87 acres | 1925 | 🌳 🌷 🐦 🪨 |
| Conneaut Swamp | Ashtabula | 55 acres | 🌳 🐊 🐦 | |
| Cooperrider-Kent Bog | Portage | 45 acres | 1987 | 🌳 🐊 🌻 🪨 🐦 |
| Crooked Run Sanctuary | Clermont | 78 acres | 1978 | 🌳 🐊 🐦 |
| Culberson Woods | Clinton | 280 acres | 1978 | 🌳 🐊 🌷 🐦 |
| Daughmer Prairie Savannah | Crawford | 34 acres | 2010 | 🦬 🐊 🌻 🐦 |
| Davey Woods | Champaign | 103 acres | 🌳 🌷 🐦 | |
| Davis Memorial | Adams | 168 acres | 🌳 🌷 🌻 🪨 🐦 | |
| Desonier (Marie J.) | Athens | 491 acres | 🌳 🐊 🌷 🌻 🐦 | |
| DuPont Marsh | Erie | 114 acres | 1980 | 🐊 🐦 |
| Eagle Creek | Portage | 472 acres | 🌳 🐊 🌷 🌻 🪨 🐦 | |
| Erie Sand Barrens | Erie | 32 acres | 🦬 🌻 🐦 | |
| Fowler Woods | Richland | 187 acres | 🌳 🐊 🌷 🐦 | |
| Gahanna Woods | Franklin | 63 acres | 🌳 🐊 🌷 🐦 | |
| Gallagher Fen | Clark | 213 acres | 🌳 🐊 🦬 🌷 🌻 🪨 🐦 | |
| Goll Woods | Fulton | 321 acres | 1974 | 🌳 🐊 🌷 🐦 |
| Goode Prairie | Miami | 28 acres | 🦬 🌻 | |
| Gross Memorial Woods | Shelby | 49 acres | 🌳 🐊 🌷 🐦 | |
| Hach-Otis | Lake | 81 acres | 🌳 🌷 🪨 🐦 | |
| Halls Creek Woods | Warren | 219 acres | 🌳 🌷 🌻 🪨 🐦 | |
| Headlands Dunes | Lake | 25 acres | 🐊 🦬 🐦 🪨 | |
| Herrick Fen | Portage | 127 acres | 🌳 🐊 🐦 🪨 | |
| Hueston Woods | Butler, Preble | 200 acres | 🌳 🌷 🐦 | |
| Hutchins (Edward F.) | Delaware, Franklin | 206 acres | 🌳 🌷 🐦 | |
| Irwin Prairie | Lucas | 207 acres | 🐊 🦬 🌻 🐦 | |
| Jackson Bog | Stark | 63 acres | 🌳 🐊 🌻 🪨 🐦 | |
| Johnson Ridge | Adams | 208 acres | 🌳 🦬 🌻 🐦 | |
| Johnson Woods | Wayne | 206 acres | 🌳 🌷 🐦 | |
| Kendrick Woods | Allen | 159 acres | 🌳 🐊 🌷 🐦 | |
| Kessler Swamp | Hocking | 20 acres | 🐊 🐦 | |
| Kiser Lake Wetlands | Champaign | 51 acres | 🌳 🐊 🌻 🐦 | |
| Kitty Todd | Lucas | 450 acres | 🐊 🦬 🌷 🌻 🐦 | |
| Knox Woods | Knox | 30 acres | 🌳 🌷 🐦 | |
| Kyle Woods | Mahoning | 82 acres | 🌳 🌷 🐦 | |
| Lake Katharine | Jackson | 2,019 acres | 1975 | 🌳 🌷 🌻 🪨 🐦 |
| Lakeside Daisy | Ottawa | 19 acres | 🌷 🌻 | |
| Lawrence Woods | Hardin | 1,035 acres | 🌳 🐊 🌷 🌻 🐦 | |
| Marsh Wetlands | Portage | 152 acres | 🌳 🐊 | |
| McCracken Fen | Logan | 94 acres | 🐊 🌻 🐦 | |
| Mentor Marsh | Lake | 646 acres | 🐊 🐦 | |
| Milford Center Prairie | Union | 9 acres | 🦬 🌻 | |
| Miller Nature Sanctuary | Highland | 86 acres | 🌳 🌷 🪨 🐦 | |
| Morris Woods | Licking | 107 acres | 🌳 🐊 🌷 🐦 | |
| North Pond | Erie | 51 acres | 🐊 🌻 🐦 | |
| North Shore Alvar | Erie | 2 acres | 🌻 🪨 🐦 | |
| Novak Sanctuary | Portage | 149 acres | 🌳 🐊 🌷 🌻 🐦 | |
| Old Woman Creek | Erie | 571 acres | 🌳 🐊 🐦 | |
| Olsen (Augusta-Anne) | Huron | 132 acres | 🌳 🐊 🌷 🌻 🐦 | |
| Owens Fen | Logan | 19 acres | 🐊 🌻 🐦 | |
| Pickerington Ponds | Fairfield | 416 acres | 🐊 🐦 | |
| Portage Lakes Wetlands | Summit | 6 acres | 🐊 | |
| Rhododendron Cove | Fairfield | 75 acres | 🌳 🌷 🌻 🪨 🐦 | |
| Riddle | Athens | 106 acres | 🌳 🌷 🐦 🪨 | |
| Rockbridge | Hocking | 202 acres | 1978 | 🌳 🌷 🪨 🐦 |
| Rocky Fork Gorge | Highland | 1,157 acres | 🌳 🌷 🪨 🐦 | |
| Scioto Brush Creek | Scioto | 30 acres | 🌳 🐊 🌷 | |
| Sears Woods | Crawford | 137 acres | 🌳 🐊 🌷 🐦 | |
| Seymour Woods | Delaware | 115 acres | 🌳 🐦 | |
| Shallenberger | Fairfield | 88 acres | 1973 | 🌳 🌷 🪨 🐦 |
| Sharon Woods Gorge | Hamilton | 21 acres | 🌳 🌷 🪨 🐦 | |
| Sheepskin Hollow | Columbiana | 468 acres | 🌳 🌷 🪨 🐦 | |
| Sheldon Marsh | Erie | 472 acres | 🌳 🐊 🌷 🪨 🐦 | |
| Shoemaker | Adams | 22 acres | 2007 | 🌳 🐊 🌷 🪨 🐦 |
| Siegenthaler-Kaestner Esker | Champaign | 37 acres | 🌻 🪨 🐦 | |
| Smith Cemetery | Madison | 0.6 acres | 🐊 🌻 | |
| Springville Marsh | Seneca | 201 acres | 🐊 🐦 | |
| Stage's Pond | Pickaway | 178 acres | 🌳 🐊 🌻 🪨 🐦 | |
| Stratford Woods | Delaware | 95 acres | 🌳 🐊 🌷 🐦 | |
| Swamp Cottonwood | Medina | 21 acres | 🌳 🐊 🐦 | |
| Thomas (Edward S.) | Franklin | 320 acres | 🌳 🌷 🌻 🐦 | |
| Tinkers Creek | Portage, Summit | 722 acres | 🌳 🐊 🐦 | |
| Triangle Lake Bog | Portage | 61 acres | 🐊 🪨 🐦 | |
| Tucker (Walter A.) | Fairfield | 55 acres | 🌳 🐊 🌷 🌻 🐦 | |
| Tummonds | Portage | 86 acres | 1986 | 🌳 🐊 🪨 🐦 |
| Wahkeena | Fairfield | 68 acres | 1957 | 🌳 🐊 🌷 🌻 🪨 🐦 |
| Whipple (Robert A.) | Adams | 448 acres | 🌳 🌷 🌻 🪨 🐦 | |
| Zimmerman Prairie | Greene | 4 acres | 🦬 🌻 |