| Amersham to Orbetello | 844.45 mi (1,359.01 km) |
| Amersham to Oria | 1,160.35 mi (1,867.40 km) |
| Amersham to Oristano | 924.44 mi (1,487.75 km) |
| Amersham to Orta Nova | 1,050.59 mi (1,690.77 km) |
| Amersham to Orte | 880.19 mi (1,416.53 km) |
| Amersham to Ortona | 953.10 mi (1,533.86 km) |
| Amersham to Orvieto | 857.51 mi (1,380.02 km) |
| Amersham to Orzinuovi | 647.25 mi (1,041.65 km) |
| Amersham to Osimo | 864.27 mi (1,390.91 km) |
| Amersham to Ospitaletto | 644.39 mi (1,037.04 km) |
| Amersham to Ostuni | 1,146.68 mi (1,845.40 km) |
| Amersham to Ottaviano | 1,034.57 mi (1,664.98 km) |
| Amersham to Ovada | 645.67 mi (1,039.11 km) |
| Amersham to Ozieri | 892.11 mi (1,435.71 km) |
| Amersham to Paceco | 1,140.97 mi (1,836.21 km) |
