O
- Ohio River. (19)
- Ohio--Adams, Mount. (1)
- Ohio--Ashtabula. (7)
- Ohio--Bass Islands. (1)
- Ohio--Centaur Lake. (1)
- Ohio--Cincinnati. (144)
- Ohio--Cleveland. (227)
- Ohio--Columbus. (74)
- Ohio--Conneaut. (6)
- Ohio--Cuyahoga River. (6)
- Ohio--Dayton. (49)
- Ohio--Fairport Harbor. (1)
- Ohio--Hamilton. (1)
- Ohio--Maumee River. (5)
- Ohio--Olentangy River. (1)
- Ohio--Oxford. (10)
- Ohio--Put-In-Bay. (95)
- Ohio--Rockefeller Lake. (1)
- Ohio--Rocky River (River) (3)
- Ohio--Tiffin. (1)
- Ohio--Toledo. (96)
- Ohio--Warren. (1)
- Ohio--Youngstown. (1)
- Ohio. (734)
- Oregon--Portland. (1)