| Keystone to Orbetello | 5,115.96 mi (8,233.34 km) |
| Keystone to Oria | 5,473.41 mi (8,808.61 km) |
| Keystone to Oristano | 5,060.21 mi (8,143.62 km) |
| Keystone to Orta Nova | 5,357.92 mi (8,622.74 km) |
| Keystone to Orte | 5,169.98 mi (8,320.28 km) |
| Keystone to Ortona | 5,266.28 mi (8,475.25 km) |
| Keystone to Orvieto | 5,149.85 mi (8,287.89 km) |
| Keystone to Orzinuovi | 4,977.51 mi (8,010.52 km) |
| Keystone to Osimo | 5,190.90 mi (8,353.95 km) |
| Keystone to Ospitaletto | 4,979.74 mi (8,014.11 km) |
| Keystone to Ostuni | 5,463.55 mi (8,792.74 km) |
| Keystone to Ottaviano | 5,315.09 mi (8,553.81 km) |
| Keystone to Ovada | 4,938.77 mi (7,948.18 km) |
| Keystone to Ozieri | 5,061.88 mi (8,146.31 km) |
| Keystone to Paceco | 5,308.69 mi (8,543.51 km) |
