- Brookside Cleveland Metropark, just south of south valley wall of Big Creek, about .2 mile northwest of the intersection of Park Drive & West 56th Street.1
- By roadside North Amherst.1
- Camden Lake Bog. Camden Twp.1
- Carroll1
- Cedar Point Amusement Park Property, 351 degrees & 3.3 miles from intersection of Cedar Point Causeway with US Rt 6, Sandusky.1
- Cedar Point National Wildlife Refuge, Little Cedar Point, NW 1/4 Sect 15, Jerusalem Township, Reno Beach Quad.1
- Cedar Point, north shore of Cedar Point about .5 mile east of entrance to amusement park, Sandusky.1
- Central Section 29 Perry Twp.,Highland Memorial Gardens; 198 Pvt. Rd. 1336, South Point. See label for further details1
- Cincinnati1
- Clermont1
- Cleveland1
- Copley Swamp, Akron1
- Coshocton1
- Cracker Barrel Restaurant at jcn of I-75 & US 224, Findley.1
- Crosscavan Farms. .08 mile due west of Newbury Twp line & 1.43 mile due north of OH Rt 87, South Russell Quad, Russell Twp.1
- Cuyahoga River, W, Peck Rd, 0.4 mi SW, bridge on Pioneer Trail, Mantua Twp, Mantua Quad.1
- Cuyahoga River.1
- Dayton1
- Defiance1
- Deist Rd at Hauncks Pond, Middle Bass Island, Put-In-Bay Quad.1