| Mersin to Octeville | 2,004.60 mi (3,226.10 km) |
| Mersin to Oignies | 1,822.19 mi (2,932.53 km) |
| Mersin to Oissel | 1,880.66 mi (3,026.64 km) |
| Mersin to Olivet | 1,820.54 mi (2,929.88 km) |
| Mersin to Ollioules | 1,577.20 mi (2,538.26 km) |
| Mersin to Olonne-sur-Mer | 1,975.15 mi (3,178.70 km) |
| Mersin to Oloron-Sainte-Marie | 1,901.87 mi (3,060.77 km) |
| Mersin to Onet Village | 1,747.88 mi (2,812.95 km) |
| Mersin to Onnaing | 1,795.22 mi (2,889.12 km) |
| Mersin to Orange | 1,637.12 mi (2,634.69 km) |
| Mersin to Orchies | 1,811.90 mi (2,915.97 km) |
| Mersin to Orleans | 1,820.75 mi (2,930.22 km) |
| Mersin to Orly | 1,813.11 mi (2,917.92 km) |
| Mersin to Ormesson-sur-Marne | 1,807.47 mi (2,908.84 km) |
| Mersin to Orsay | 1,821.35 mi (2,931.18 km) |
