| San Severino Marche to Orbetello | 113.50 mi (182.67 km) |
| San Severino Marche to Oria | 296.79 mi (477.63 km) |
| San Severino Marche to Oristano | 329.91 mi (530.94 km) |
| San Severino Marche to Orta Nova | 184.33 mi (296.65 km) |
| San Severino Marche to Orte | 66.53 mi (107.06 km) |
| San Severino Marche to Ortona | 86.79 mi (139.67 km) |
| San Severino Marche to Orvieto | 64.44 mi (103.71 km) |
| San Severino Marche to Orzinuovi | 219.55 mi (353.34 km) |
| San Severino Marche to Osimo | 23.36 mi (37.59 km) |
| San Severino Marche to Ospitaletto | 222.05 mi (357.35 km) |
| San Severino Marche to Ostuni | 284.44 mi (457.77 km) |
| San Severino Marche to Ottaviano | 177.39 mi (285.48 km) |
| San Severino Marche to Ovada | 245.55 mi (395.17 km) |
| San Severino Marche to Ozieri | 281.78 mi (453.48 km) |
| San Severino Marche to Paceco | 363.92 mi (585.68 km) |
