| Grottaferrata to Oria | 273.02 mi (439.39 km) |
| Grottaferrata to Oristano | 249.74 mi (401.93 km) |
| Grottaferrata to Orta Nova | 160.29 mi (257.96 km) |
| Grottaferrata to Orte | 48.68 mi (78.35 km) |
| Grottaferrata to Ortona | 96.77 mi (155.73 km) |
| Grottaferrata to Orvieto | 70.38 mi (113.26 km) |
| Grottaferrata to Orzinuovi | 284.65 mi (458.10 km) |
| Grottaferrata to Osimo | 124.16 mi (199.82 km) |
| Grottaferrata to Ospitaletto | 290.83 mi (468.04 km) |
| Grottaferrata to Ostuni | 265.27 mi (426.91 km) |
| Grottaferrata to Ottaviano | 113.94 mi (183.37 km) |
| Grottaferrata to Ovada | 282.57 mi (454.76 km) |
| Grottaferrata to Ozieri | 208.06 mi (334.84 km) |
| Grottaferrata to Paceco | 262.98 mi (423.22 km) |
| Grottaferrata to Pachino | 373.68 mi (601.38 km) |
