| Buckingham to Orbetello | 871.51 mi (1,402.56 km) |
| Buckingham to Oria | 1,186.28 mi (1,909.14 km) |
| Buckingham to Oristano | 951.75 mi (1,531.69 km) |
| Buckingham to Orta Nova | 1,076.81 mi (1,732.96 km) |
| Buckingham to Orte | 906.97 mi (1,459.63 km) |
| Buckingham to Ortona | 979.34 mi (1,576.10 km) |
| Buckingham to Orvieto | 884.29 mi (1,423.12 km) |
| Buckingham to Orzinuovi | 673.68 mi (1,084.18 km) |
| Buckingham to Osimo | 890.35 mi (1,432.87 km) |
| Buckingham to Ospitaletto | 670.67 mi (1,079.34 km) |
| Buckingham to Ostuni | 1,172.55 mi (1,887.03 km) |
| Buckingham to Ottaviano | 1,061.26 mi (1,707.94 km) |
| Buckingham to Ovada | 672.79 mi (1,082.74 km) |
| Buckingham to Ozieri | 919.48 mi (1,479.76 km) |
| Buckingham to Paceco | 1,168.33 mi (1,880.24 km) |
