| Cincinnati to Oswego (Illinois) | 267.29 mi (430.16 km) |
| Cincinnati to Oswego (New York) | 510.88 mi (822.18 km) |
| Cincinnati to Otsego (Minnesota) | 629.09 mi (1,012.42 km) |
| Cincinnati to Ottawa (Illinois) | 274.37 mi (441.55 km) |
| Cincinnati to Ottawa (Kansas) | 579.56 mi (932.71 km) |
| Cincinnati to Ottumwa (Iowa) | 437.79 mi (704.55 km) |
| Cincinnati to Overland (Missouri) | 316.61 mi (509.53 km) |
| Cincinnati to Overland Park (Kansas) | 546.56 mi (879.61 km) |
| Cincinnati to Overlea (Maryland) | 427.55 mi (688.07 km) |
| Cincinnati to Oviedo (Florida) | 748.75 mi (1,205.00 km) |
| Cincinnati to Owasso (Oklahoma) | 649.11 mi (1,044.64 km) |
| Cincinnati to Owatonna (Minnesota) | 565.24 mi (909.67 km) |
| Cincinnati to Owensboro (Kentucky) | 170.59 mi (274.54 km) |
| Cincinnati to Owings Mills (Maryland) | 412.92 mi (664.53 km) |
| Cincinnati to Owosso (Michigan) | 266.85 mi (429.46 km) |
