| Heerenveen to Orbetello | 766.06 mi (1,232.86 km) |
| Heerenveen to Oria | 1,020.38 mi (1,642.14 km) |
| Heerenveen to Oristano | 909.95 mi (1,464.42 km) |
| Heerenveen to Orta Nova | 923.12 mi (1,485.62 km) |
| Heerenveen to Orte | 783.64 mi (1,261.14 km) |
| Heerenveen to Ortona | 830.36 mi (1,336.33 km) |
| Heerenveen to Orvieto | 762.09 mi (1,226.47 km) |
| Heerenveen to Orzinuovi | 551.84 mi (888.09 km) |
| Heerenveen to Osimo | 739.76 mi (1,190.52 km) |
| Heerenveen to Ospitaletto | 543.74 mi (875.06 km) |
| Heerenveen to Ostuni | 1,004.99 mi (1,617.38 km) |
| Heerenveen to Ottaviano | 926.72 mi (1,491.41 km) |
| Heerenveen to Ovada | 587.24 mi (945.06 km) |
| Heerenveen to Ozieri | 866.40 mi (1,394.34 km) |
| Heerenveen to Paceco | 1,081.52 mi (1,740.55 km) |
