- A W Marion State Park
- Acacia Reservation
- Acadia Cliffs Wildlife Area
- Adams Lake Prarie State Nature Preserve
- Alderfer-Oenslager Wildlife Sanctuary
- Alum Creek State Park
- Amberfield Parkland
- American Landfill Certified Wildlife Habitat
- Anderson Compass Plant Prairie
- Anderson Run Riparian Corridor Preservation
- Anliot-Davidson Woods
- Appalachia Ohio Alliance Demonstration Area
- Aquilla Lake Wildlife Area
- Arthur Kyle Woods State Nature Preserve
- Ashcroft Woods Conservation Area
- Ashtabula County Wildlife & Conservation League
- Astorhurst Park
- Auburn Marsh Wildlife Area
- Audubon Islands Nature Preserve
- Audubon Society
- Audubon Wetlands Preserve
- Auglaize Fish & Game Association
- Avon Wetlands
- Bachelor Preserve
- Bachelor Preserve - Marcum
- Bachelor Preserve North Loop
- Baker Preserve
- Baker Woods
- Baldwin Creek Preserve
- Baldwin Woods Preserve
- Barkcamp State Park
- Bath Nature Preserve
- Bath Road Heronry
- Battelle Darby Creek Metro Park
- Beaumont Scout Reservation
- Beaver Creek Preserve
- Beaver Creek State Forest
- Beaver Creek Wildlife Area
- Beaver Township Nature Preserve
- Beavercreek Wildlife Recreation Area
- Beavercreek Wildlife Recreational Area
- Becks Preserve
- Becvar Preserve
- Bedford Reservation
- Benjamin Woods Preserve
- Bessie Benner Metzenbaum Park
- Bettman Preserve
- Big Creek Park
- Big Creek Reservation
- Big Creek Spur
- Big Darby Headwaters Nature Preserve
- Big Island Wildlife Area
- Big Walnut-Edgewater Parkland
- Bigelow Cemetery State Nature Preserve
- Bird Sanctuary
- Black Hand Gorge State Nature Preserve
- Black Swamp Nature Center
- Black Swamp Preserve
- Blacklick Woods Metro Park
- Blair Preserve
- Blanche Katherine Novak Wildlife Sanctuary and State Nature Preserve
- Blendon Woods Metro Park
- Blue Heron Reserve
- Bluebell Preserve
- Bluffton Nature Preserve
- Boch Hollow State Nature Preserve
- Bonnoront Preserve
- Boord State Nature Preserve
- Bortz Family Nature Preserve
- Boss Unit - Ottawa NWR
- Boyer Nature Preserve
- Braceville Nature Preserve
- Bracken Woods Brodbeck Preserve
- Bradley Woods Reservation
- Bradner Preserve
- Brail trail
- Brail trail nature reserve
- Brecksville Reservation
- Broken Aro Wildlife Area
- Brook Wildlife Area
- Brookville Preserve
- Broughton Nature and Wildlife Education Area
- Brukner Nature Center
- Brush Creek Wildlife Area
- Buck Run Conservation area
- Buffchardd Preserve
- Burton Wetlands
- Butterfly Habitat Restoration Project
- Buzzard's Roost Nature Preserve
- Buzzardroost Rock Preserve
- Cackley Swamp Preserve
- Caldwell Preserve
- California Woods Nature Preserve
- Camp Knee-Bow
- Campbell Lakes Preserve
- Canaan Preserve
- Carmean Woods State Nature Preserve
- Carter Preserve
- Catalpa Park
- Catawba Island Nature Preserve
- Cedar Point National Wildlife Refuge
- Celebration Grove
- Chalet Nivale Nature Preserve
- Chaparral Prarie
- Charles Alley Nature Park
- Charles Tummonds State Nature Preserve
- Charles Young Buffalo Soldiers National Monument
- Charleston Falls Preserve
- Children's Home Tract
- Christmas Rocks Nature Preserve
- Cincinnati Nature Center: Long Branch Farm & Trails
- Clarington 254 Park
- Clear Creek
- Clear Creek Metro Park
- Cleveland Lakefront Nature Preserve
- Cleveland Museum of Natural History Preserve
- Clifton Gorge State Nature Preserve
- Cline Preserve
- Coldwater Nature Preserve
- Colfax Lake
- College Woods
- Collier Preserve
- Collier Preserve Expansion
- Columbia Reservation
- Conant Wildlife Area
- Conkles Hollow State Nature Preserve
- Conneaut State Wildlife Area
- Consol Energy Powhatan Point Hunting Area
- Cook Preserve
- Cooper's Woods Preserve
- Coppess Nature Sanctuary
- Cossin-Kreisel Preserve
- Cranberry Bog State Nature Preserve
- Cranberry Run Headwaters
- Crooked Creek Conservation Club
- Cross Mound Park
- Cuyahoga Valley National Park
- Darke Wildlife Area
- Davey Woods Nature Preserve
- Davis Memorial State Nature Preserve
- Deems Parkland
- Deep Hollow-Dark Skies Preserve
- Deer Crossing Reserve
- Delaware Reservoir Wildlife Area
- Della Gates & Edward Charles Bott Wildlife Area
- Denison Biological Reserve / Polly Anderson Field Station
- Denison University Biological Preserve
- Dillion State Park
- Dillon Reservoir Wildlife Area
- Dillon State Wildlife Area
- Doctor Nathan Hale Riparian Reserve
- Dodge Woods Preserve
- Donna May Campbell Preserve
- Dorset Wildlife Area
- Dr. Elizabeth Yahl Kuffner Nature Preserve
- Drew Woods State Nature Preserve
- Dublin Kiwanis Riverway Park
- Duff Homestead & Bayfront Preserve
- Duff Woods Preserve
- E. Lucy Braun Lynx Prairie Preserve
- Eagle Creek State Nature Preserve
- East Fork Tailwater State Wildlife Area
- East Fork Wetlands
- East Loveland Nature Preserve
- Ecology - Ethology Research Station
- Ed Curilla Preserve
- Edison Woods Reserve
- Edward F. Hutchins Nature Preserve
- Edward S. Thomas Nature Preserve
- Egypt Swamp Preserve
- Eidson Woods Preserve
- Endangered Waterfowl Conservation Facility
- Erie Sand Barrens Nature Preserve
- Euclid Creek Reservation
- Farbach-Werner Nature Preserve
- Farrington Reserve
- Ferald Ritchie Nature Preserve
- Fernald Preserve
- Fernwood State Forest
- Firelands Scout Reservation
- Flannery Island
- Forest Lake Wildlife Preserve
- Forest Ridge Preserve
- Fort Ancient State Memorial
- Fort Jefferson State Historic Site
- Fowler Woods State Nature Preserve
- Fox Marsh Wildlife Area
- Fox Nature Preserve - Ottawa NWR
- Frank Hosea Woods Park
- Franklin Bog Nature Preserve
- Friends of Fort Jefferson
- Fuller Preserve
- Galpin Wildlife Area
- Garfield Park Reservation
- Genevieve Jones Preserve
- Glacial Grooves Geological Preserve
- Glen Helen Nature Preserve
- Glenshire Reserve
- Glenway Woods
- Glenwood Green
- Goll Woods Nature Preserve
- Goltra Preserve
- Gorman Nature Park
- Gosnell Preserve
- Governor Bebb MetroPark
- Grailville Nature Preserve
- Grand River Conservation Campus
- Grand River Preserve
- Grand River State Wildlife Area
- Grand River Wildlife Area
- Grand Valley Preserve
- Granger Wetlands Park
- Grant Lake Wildlife Area
- Gray Birch Bog Preserve
- Great Seal State Park
- Green Island Wildlife Area
- Greenville Falls State Nature Preserve
- Grimm Prairie - Ottawa NWR
- Gross Woods Nature Preserve
- Gully Brook Park
- Gump Woods
- Gunning Preserve
- Hach-Otis State Nature Preserve
- Haddox Preserve
- Hambden Orchard Wildlife Area
- Hancock County Wetland
- Hansel Nature Preserve
- Harris Miller Benedict Botanical Preserve
- Harrison Lake State Park
- Hawkins Marsh
- Headlands Dunes State Nature Preserve
- Headwaters Park
- Hebble Creek Preserve
- Helen S. Ruder Preserve
- Hermon Woodlands
- Highland Bat Sanctuary
- Highlands Nature Sanctuary
- Hinckley Reservation
- Hintz Hollow Preserve
- Historic Bear's Mill Preserve
- Hitchcock Woods
- Hocking Canal Lock No. 8
- Hocking Hills State Park
- Hocking State Forest
- Holbrook Hollows
- Holden Arboretum
- Holden Arboretum
- Holzapfel Preserve
- Honey Point Wildlife Area
- Hoover Dam Park
- Howland Township Preserve
- Hueston Woods State Park
- Huffman Prairie State Natural Landmark
- Huntington Woods
- Huntley-Beatty Preserve
- Igel Preserve
- Imago
- Independence Dam State Park
- Indian Hills Trails
- Indian Rock Park
- Irwin Prairie State Nature Preserve
- Island View Park
- J. Arthur Herrick Fen Nature Preserve
- James H. Barrow Biological Field Station
- James H. McBride Arboretum
- Jessie Smith Wildlife Preserve
- John and Carroll Ullich Meadows
- John and Marion Becker Cedar Falls Preserve
- John Bryan State Park
- Johnson Nature Preserve
- Johnson Ridge State Nature Preserve
- Jones Preserve
- Jones Property Conservation Easement
- Joseph Steinen Wildlife Area
- Ka-ma-ma Prairie
- Katie Wilson Schneider Preserve
- Kaul Wildlife Area
- Keller-Kirn Park
- Kenney Park Nature Preserve
- Kiedaisch Point Park
- Killdeer Plains Wildlife Area
- Kiser Lake Wetlands Nature Preserve
- Kleinmaier State Nature Preserve
- Kopf Family Reservation
- Kramer Preserve
- Kreisel Preserve
- Kroger Hills
- Kroger Wetlands
- KSU Research Area
- Kuehnle Wildlife Area
- Ladd Carr Wildlife Woods
- LaDue State Wildlife Area
- Lake Erie Bluffs
- Lake Erie Islands Nature & Wildlife Center
- Lake Hope State Park
- Lake La Su An Wildlife Area
- Lake White State Park
- Lakeside Daisy State Nature Preserve
- Lamb Preserve
- Lawrence Conservation Area
- Leesville Wildlife Area
- Lesli Johnson Preserve
- Lindy Roosenburg Preserve
- Little Beaver Creek Scenic River Area
- Little Duck Creek Nature Preserve
- Little Girard Creek Conservation Park
- Little Miami Conservancy Preserve
- Little Miami State Park
- Little Portage River Wildlife Area
- Little Portage Unit - Ottawa NWR
- Lobdell Preserve
- Locust Corner Nature Area
- Lois Busch Winner Nature Preserve
- Louis W. Campbell State Nature Preserve
- Lucia S. Nash Preserve
- Lye Creek Riparain Restoration Project
- Mackey Ford State Wildlife Area
- Madison Lake State Park
- Magee Marsh Wildlife Area
- Makris Parkland
- Malabar Farm State Park
- Mambourg Park
- Maple Ridge
- Margaret Peak Nature Preserve
- Marie J. Desonier State Nature Preserve
- Marietta Run Preserve
- Marinewood Unit - Ottawa NWR
- Marsh Wetlands State Nature Preserve
- Marsha Gunder Schneider Preserve
- Mary Beth Zak Lohse Nature Preserve
- Mary Jane Thurston State Park
- Massie Cliffside Preserve
- Maumee Bay State Park
- McKelvey Lake Preserve
- Meijer Conservation Easement
- Mentor Lagoons Nature Preserve
- Mentor Marsh State Nature Preserve
- Mercer Wildlife Area
- Mercer Woods Preserve
- Mercy Community Nature Preserve
- Mesopotamia Hunting Area
- Metzger Marsh
- Michael Murray Wildlife Area
- Middle Bass Forested Wetland Preserve
- Middle Bass Island East Point Preserve
- Middle Bass Island State Park
- Middle Toussaint Unit - Ottawa NWR
- Mill Creek Wildlife Sanctuary
- Mill Stream Run Reservation
- Miller Blue Hole Wildlife Area
- Miller Sanctuary State Nature Preserve
- Missionary Island State Wildlife Area
- Mitchell Memorial Forest
- Modroo Preserve
- Mohican Memorial State Forest
- Monarch Waystation
- Montpelier Woods
- Morgan Swamp Preserve
- Morgana Bluffs Nature Preserve
- Morris Reserve
- Morris Woods State Nature Preserve
- Morrison Woods Preserve
- Mosquito Creek Lake Recreation Area - USACE
- Mosquito Creek State Wildlife Area
- Mosquito Lake State Park
- Mount Airy Forest
- Mount Gilead State Park
- Mud Lake Bog Nature Preserve
- Narrows Reserve
- Native Praire Habitat
- Nehls Memorial Nature Preserve
- Nero Nature Preserve
- New Lyme Wildlife Area
- Newberry Wildlife Sanctuary
- Newton Nature Lab
- North Bass Island State Park
- North Chagrin Reservation
- North Pond State Nature Preserve
- North Shore Alvar Nature Preserve
- North Wickliffe Riparian Corridor
- Northern Tuscarawas Land Trust
- Oak Glen
- Oak Openings Preserve Metropark
- Oberlin Preserve
- Observatory Park
- Ohio & Erie Canal Reservation
- Ohio River Islands National Wildlife Refuge
- Old Town Creek Access
- Old Woman Creek Estuary & Nature Reserve
- Old Woman Creek Nature Center
- Oldtown Creek Preserve
- Olentangy Nature Preserve
- Olentangy River State Wildlife Access Area
- Orwell State Wildlife Area
- Ottawa National Wildlife Refuge
- Overlook Reserve
- Oxbow Lake State Wildlife Area
- Paradise Hill Nature Preserve
- Paul B Sears Woods State Nature Preserve
- Paul Murray Wildlife Area
- Paul Prevey Bird Sanctuary
- Peach Preserve
- Peffer Woods
- Perry's Victory and International Peace Memorial
- Petersen's Woods
- Piatt Park Gorge & Cave Area
- Pickerel Creek Wildlife Area
- Pickerington Pond Wetlands Nature Preserve
- Pickerington Ponds Metro Park
- Pierce Preserve
- Pike Lake State Park
- Pipe Creek Wildlife Area
- Pleasant Hill Lake Park
- Pleasant Valley State Wildlife Area
- Plum Run Prarie
- Poland Municipal Forest
- Port Clinton Lakefront Preserve
- Portage Lakes Wetland State Nature Preserve
- Poston Nature Preserve
- Poston Plant Lands
- Prairie Ridge Meadow
- Princess Ledges Nature Reserve
- Prokesh & Watson Tracts
- Pymatuning State Park
- Quaker Ridge Arboretum & Nature Trails
- Quinn Preserve
- Quiverheart Gorge
- Raemelton Park Developers
- Raemelton Therapeutic Equestrian Center
- Ramser Arboretum
- Ramser Arboretum MVNU Woods
- Raven Rock
- Raven Rocks
- Ray and Betty Wampler Preserve
- Reagan Highway Wetlands
- Refugee Preserve
- Reinhart Preserve
- Resilience Woods
- Resthaven Wildlife Area
- Restricted Area Eagle Nest
- Restricted Area Eagle Nest
- Rhododendron Cove State Nature Preserve
- Richardson Forest Preserve
- Richfield Nature Preserve
- Riddle State Nature Preserve
- Ritchie Preserve
- Ritter Wildlife Area
- River Ridge Nature Preserve
- Riverbend Conservation Area
- Roadside Wildlife Area
- Rock Mill Lake Wildlife Area
- Rockbridge State Nature Preserve
- Rocky River Reservation
- Ross Lake State Wildlife Area
- Rothenbuhler Woods Nature Preserve
- Routzong Preserve
- Rowe Woods
- Rudolph Farms
- Rudolph Savannah
- Russ Nature Reserve
- Russell Uplands Preserve
- Ruthven Nature Preserve
- Samuel L. Fox Preserve
- Sara Lee Arnovitz Nature Preserve
- Sawmill Creek Preserve
- Sawyer Quarry Nature Preserve
- Scenic River Retreat
- Scheeff East Point Preserve
- Scheele Preserve
- Schneider Preserve
- Scott Creek Preserve
- Sebring Woods
- Seymour Nature Preserve
- Shale Hollow Park
- Shallenberger State Nature Preserve
- Shawnee Prairie Preserve
- Shawnee Prairie Preserve
- Shawnee State Forest Wilderness Area
- Sheepskin Hollow State Nature Preserve
- Sheldon Marsh Nature Preserve
- Shenango Wildlife Area
- Shoemaker State Nature Preserve
- Siegenthaler-Kaestner Esker State Nature Preserve
- Silvoor Biological Sanctuary
- Singer Lake Bog
- Skunk Run Preserve
- Slate Run Metro Park
- South Chagrin Reservation
- Southbridge Nature Preserve
- Southdown Reserve
- Speedway Nature Reserve
- Spring Brook Sanctuary
- Spring Run Conservation Area
- Springfield Woods Nature Preserve
- Springville Marsh State Nature Preserve
- Stage's Pond State Nature Preserve
- Stange Prairie - Ottawa NWR
- Stillwater Prairie Rangeline
- Stillwater Prairie Reserve
- Stone Canyon Preserve
- Stoney Hill Preserve
- Strait Creek Prairie Bluffs Nature Preserve
- Stratford Ecological Center
- Stream Restoration Area
- Strongsville Backyard Preserve
- Strongsville Wildlife Area
- Stroth-Rader Habitat Conservation Area
- Strouds Ridge Preserve Bean Tract
- Strouds Ridge Preserve COAD Tract
- Strouds Ridge Reserve Hope Drive Tract
- Strouds Run State Park
- Sugar Island Preserve
- Sunfish Creek State Forest
- Susan Hambley Nature Center
- Swamp Cottonwood State Nature Preserve
- Sweet Arrow Reserve
- Swine Creek Reservation
- Taft Reserve North
- Taft Reserve South
- Tar Hollow State Park
- Tecumseh Point
- Ten-Mile Creek Nature Preserve
- Terra Vista Natural Study Area
- The Coupling Reserve
- The Plains Preserve
- The Ridges
- The Rookery
- The West Woods
- Theresa Street Reserve
- Three Creeks Metro Park
- Tinkers Creek Nature Preserve
- Tom S Cooperrider-Kent Bog State Nature Preserve
- Toussaint Creek Wildlife Area
- Tranquility State Wildlife Area
- Tremper Mound Preserve
- Triangle Lake Bog State Nature Preserve
- Trimble Township Community Forest
- Tucker Run Preserve
- Turkey Creek Metropark
- Turkey Run Unit - Ottawa NWR
- Turkeyfoot Preserve
- Turtle Creek Island Unit - Ottawa NWR
- Two Glaciers Park
- University Prairie Reserve
- Upper Toussaint Unit - Ottawa NWR
- Urbana Wildlife Propagation Unit
- Utzinger Bog Preserve
- Valley View Nature Preserve
- Van Buren State Park
- Vickers Nature Preserve
- Victory Woods
- Vogelsong Conservation Area
- Wahkeena Nature Preserve
- Walden Waterfowl Refuge
- Walkers Meadow
- Walnut Woods Metro Park
- Walter A Tucker Nature Preserve
- Walter C. Best Wildlife Preserve
- Washington Reservation
- Waterloo State Wildlife Management Area
- Wellington Reservation
- Welsh Hill Preserve
- Welton's Gorge Preserve
- West Creek Reservation
- West Farmington Hunting Area
- West Harbor Landing - Ottawa NWR
- West Sister Island National Wildlife Refuge
- Western Woods
- Whipple State Nature Preserve
- Whitesburg Nature Preserve
- Whitlam Woods
- Willard Marsh Wildlife Area
- William Holmes McGuffey Wildlife Preserve
- William Howard Taft National Historic Site
- William J Robertson Nature Preserve
- Willoughby Preserve
- Willow Creek Preserve
- Willow Point Wildlife Area
- Wilma H. Shiermeier Olentangy River Wetland Research Park
- Wilson Nature Preserve
- Winterrowd Wetland Preserve
- Woodbury Wildlife Area
- Woodcock Nature Preserve
- Woodward Nature Preserve
- Worth Family Nature Preserve
- WRA Cabins
- Writsel Preserve
- Wyandot Wildlife Area
- Yellow Creek Riparian Corridor
- Yellow Creek State Forest
- Youngstown Eastside Open Space Preserve
- Zepernick Lake Wildlife Area