| Castellana Grotte to Oria | 36.04 mi (58.00 km) |
| Castellana Grotte to Oristano | 456.07 mi (733.97 km) |
| Castellana Grotte to Orta Nova | 81.83 mi (131.69 km) |
| Castellana Grotte to Orte | 269.66 mi (433.98 km) |
| Castellana Grotte to Ortona | 175.18 mi (281.93 km) |
| Castellana Grotte to Orvieto | 289.59 mi (466.05 km) |
| Castellana Grotte to Orzinuovi | 479.63 mi (771.89 km) |
| Castellana Grotte to Osimo | 260.40 mi (419.07 km) |
| Castellana Grotte to Ospitaletto | 481.07 mi (774.21 km) |
| Castellana Grotte to Ostuni | 24.13 mi (38.83 km) |
| Castellana Grotte to Ottaviano | 140.53 mi (226.15 km) |
| Castellana Grotte to Ovada | 503.74 mi (810.69 km) |
| Castellana Grotte to Ozieri | 427.74 mi (688.38 km) |
| Castellana Grotte to Paceco | 317.48 mi (510.94 km) |
| Castellana Grotte to Pachino | 308.62 mi (496.67 km) |
