| Rocky River to Orbetello | 4,514.21 mi (7,264.92 km) |
| Rocky River to Oria | 4,861.09 mi (7,823.17 km) |
| Rocky River to Oristano | 4,500.82 mi (7,243.37 km) |
| Rocky River to Orta Nova | 4,746.60 mi (7,638.91 km) |
| Rocky River to Orte | 4,562.48 mi (7,342.60 km) |
| Rocky River to Ortona | 4,650.41 mi (7,484.11 km) |
| Rocky River to Orvieto | 4,540.76 mi (7,307.65 km) |
| Rocky River to Orzinuovi | 4,347.81 mi (6,997.13 km) |
| Rocky River to Osimo | 4,567.02 mi (7,349.91 km) |
| Rocky River to Ospitaletto | 4,347.72 mi (6,996.97 km) |
| Rocky River to Ostuni | 4,849.05 mi (7,803.79 km) |
| Rocky River to Ottaviano | 4,715.18 mi (7,588.34 km) |
| Rocky River to Ovada | 4,323.16 mi (6,957.45 km) |
| Rocky River to Ozieri | 4,492.32 mi (7,229.69 km) |
| Rocky River to Paceco | 4,751.08 mi (7,646.13 km) |
