| Roma to Orbetello | 5,933.92 mi (9,549.72 km) |
| Roma to Oria | 6,283.36 mi (10,112.09 km) |
| Roma to Oristano | 5,910.45 mi (9,511.96 km) |
| Roma to Orta Nova | 6,168.48 mi (9,927.22 km) |
| Roma to Orte | 5,983.33 mi (9,629.24 km) |
| Roma to Ortona | 6,072.76 mi (9,773.17 km) |
| Roma to Orvieto | 5,961.82 mi (9,594.63 km) |
| Roma to Orzinuovi | 5,771.39 mi (9,288.15 km) |
| Roma to Osimo | 5,990.29 mi (9,640.44 km) |
| Roma to Ospitaletto | 5,771.55 mi (9,288.42 km) |
| Roma to Ostuni | 6,271.61 mi (10,093.18 km) |
| Roma to Ottaviano | 6,135.07 mi (9,873.45 km) |
| Roma to Ovada | 5,744.75 mi (9,245.29 km) |
| Roma to Ozieri | 5,904.71 mi (9,502.72 km) |
| Roma to Paceco | 6,161.19 mi (9,915.48 km) |
