| Marum to Orbetello | 774.35 mi (1,246.19 km) |
| Marum to Oria | 1,023.23 mi (1,646.73 km) |
| Marum to Oristano | 921.61 mi (1,483.18 km) |
| Marum to Orta Nova | 927.24 mi (1,492.25 km) |
| Marum to Orte | 790.58 mi (1,272.32 km) |
| Marum to Ortona | 835.16 mi (1,344.06 km) |
| Marum to Orvieto | 769.21 mi (1,237.93 km) |
| Marum to Orzinuovi | 560.21 mi (901.57 km) |
| Marum to Osimo | 744.79 mi (1,198.63 km) |
| Marum to Ospitaletto | 551.80 mi (888.04 km) |
| Marum to Ostuni | 1,007.74 mi (1,621.80 km) |
| Marum to Ottaviano | 932.33 mi (1,500.44 km) |
| Marum to Ovada | 597.80 mi (962.07 km) |
| Marum to Ozieri | 877.57 mi (1,412.31 km) |
| Marum to Paceco | 1,090.06 mi (1,754.28 km) |
