| Ollerton to Orbetello | 932.61 mi (1,500.88 km) |
| Ollerton to Oria | 1,236.60 mi (1,990.11 km) |
| Ollerton to Oristano | 1,023.69 mi (1,647.47 km) |
| Ollerton to Orta Nova | 1,129.44 mi (1,817.66 km) |
| Ollerton to Orte | 964.91 mi (1,552.87 km) |
| Ollerton to Ortona | 1,032.39 mi (1,661.48 km) |
| Ollerton to Orvieto | 942.26 mi (1,516.42 km) |
| Ollerton to Orzinuovi | 729.15 mi (1,173.46 km) |
| Ollerton to Osimo | 942.31 mi (1,516.50 km) |
| Ollerton to Ospitaletto | 725.05 mi (1,166.85 km) |
| Ollerton to Ostuni | 1,222.39 mi (1,967.24 km) |
| Ollerton to Ottaviano | 1,118.02 mi (1,799.27 km) |
| Ollerton to Ovada | 735.15 mi (1,183.11 km) |
| Ollerton to Ozieri | 989.64 mi (1,592.66 km) |
| Ollerton to Paceco | 1,234.64 mi (1,986.96 km) |
