| North Adams to Orbetello | 4,094.67 mi (6,589.73 km) |
| North Adams to Oria | 4,445.67 mi (7,154.61 km) |
| North Adams to Oristano | 4,070.90 mi (6,551.48 km) |
| North Adams to Orta Nova | 4,330.51 mi (6,969.28 km) |
| North Adams to Orte | 4,144.68 mi (6,670.22 km) |
| North Adams to Ortona | 4,235.29 mi (6,816.04 km) |
| North Adams to Orvieto | 4,123.33 mi (6,635.86 km) |
| North Adams to Orzinuovi | 3,935.76 mi (6,333.99 km) |
| North Adams to Osimo | 4,153.98 mi (6,685.18 km) |
| North Adams to Ospitaletto | 3,936.38 mi (6,334.99 km) |
| North Adams to Ostuni | 4,434.21 mi (7,136.17 km) |
| North Adams to Ottaviano | 4,295.83 mi (6,913.47 km) |
| North Adams to Ovada | 3,906.80 mi (6,287.39 km) |
| North Adams to Ozieri | 4,064.66 mi (6,541.43 km) |
| North Adams to Paceco | 4,321.60 mi (6,954.94 km) |
