| Rhymney to Orbetello | 934.63 mi (1,504.15 km) |
| Rhymney to Oria | 1,260.45 mi (2,028.50 km) |
| Rhymney to Oristano | 996.01 mi (1,602.92 km) |
| Rhymney to Orta Nova | 1,148.99 mi (1,849.13 km) |
| Rhymney to Orte | 973.93 mi (1,567.39 km) |
| Rhymney to Ortona | 1,051.48 mi (1,692.19 km) |
| Rhymney to Orvieto | 951.34 mi (1,531.04 km) |
| Rhymney to Orzinuovi | 745.17 mi (1,199.24 km) |
| Rhymney to Osimo | 964.04 mi (1,551.47 km) |
| Rhymney to Ospitaletto | 743.37 mi (1,196.35 km) |
| Rhymney to Ostuni | 1,247.22 mi (2,007.20 km) |
| Rhymney to Ottaviano | 1,128.91 mi (1,816.81 km) |
| Rhymney to Ovada | 735.78 mi (1,184.13 km) |
| Rhymney to Ozieri | 967.62 mi (1,557.23 km) |
| Rhymney to Paceco | 1,222.11 mi (1,966.79 km) |
