| Comacchio to Oswego (Illinois) | 4,714.41 mi (7,587.11 km) |
| Comacchio to Oswego (New York) | 4,165.65 mi (6,703.97 km) |
| Comacchio to Otsego (Minnesota) | 4,745.92 mi (7,637.83 km) |
| Comacchio to Ottawa (Illinois) | 4,748.36 mi (7,641.75 km) |
| Comacchio to Ottawa (Kansas) | 5,126.74 mi (8,250.69 km) |
| Comacchio to Ottumwa (Iowa) | 4,901.93 mi (7,888.90 km) |
| Comacchio to Overland (Missouri) | 4,932.28 mi (7,937.73 km) |
| Comacchio to Overland Park (Kansas) | 5,090.73 mi (8,192.74 km) |
| Comacchio to Overlea (Maryland) | 4,332.43 mi (6,972.38 km) |
| Comacchio to Oviedo (Florida) | 5,009.44 mi (8,061.91 km) |
| Comacchio to Owasso (Oklahoma) | 5,262.55 mi (8,469.26 km) |
| Comacchio to Owatonna (Minnesota) | 4,787.10 mi (7,704.09 km) |
| Comacchio to Owensboro (Kentucky) | 4,845.53 mi (7,798.13 km) |
| Comacchio to Owings Mills (Maryland) | 4,342.15 mi (6,988.02 km) |
| Comacchio to Owosso (Michigan) | 4,493.37 mi (7,231.39 km) |
