| Priolo Gargallo to Orbetello | 420.76 mi (677.15 km) |
| Priolo Gargallo to Oria | 265.36 mi (427.05 km) |
| Priolo Gargallo to Oristano | 403.25 mi (648.96 km) |
| Priolo Gargallo to Orta Nova | 289.09 mi (465.25 km) |
| Priolo Gargallo to Orte | 394.67 mi (635.16 km) |
| Priolo Gargallo to Ortona | 360.53 mi (580.22 km) |
| Priolo Gargallo to Orvieto | 416.61 mi (670.47 km) |
| Priolo Gargallo to Orzinuovi | 630.45 mi (1,014.61 km) |
| Priolo Gargallo to Osimo | 445.50 mi (716.96 km) |
| Priolo Gargallo to Ospitaletto | 636.96 mi (1,025.09 km) |
| Priolo Gargallo to Ostuni | 278.10 mi (447.56 km) |
| Priolo Gargallo to Ottaviano | 257.29 mi (414.08 km) |
| Priolo Gargallo to Ovada | 618.47 mi (995.33 km) |
| Priolo Gargallo to Ozieri | 407.61 mi (655.98 km) |
| Priolo Gargallo to Paceco | 154.84 mi (249.19 km) |
