| Adra to Orbetello | 852.00 mi (1,371.16 km) |
| Adra to Oria | 1,141.53 mi (1,837.12 km) |
| Adra to Oristano | 665.32 mi (1,070.73 km) |
| Adra to Orta Nova | 1,051.27 mi (1,691.85 km) |
| Adra to Orte | 908.13 mi (1,461.50 km) |
| Adra to Ortona | 1,002.99 mi (1,614.15 km) |
| Adra to Orvieto | 901.57 mi (1,450.94 km) |
| Adra to Orzinuovi | 899.24 mi (1,447.19 km) |
| Adra to Osimo | 985.75 mi (1,586.41 km) |
| Adra to Ospitaletto | 911.14 mi (1,466.33 km) |
| Adra to Ostuni | 1,140.86 mi (1,836.03 km) |
| Adra to Ottaviano | 981.76 mi (1,579.99 km) |
| Adra to Ovada | 817.38 mi (1,315.45 km) |
| Adra to Ozieri | 699.77 mi (1,126.17 km) |
| Adra to Paceco | 858.03 mi (1,380.87 km) |
