| On Top of the World Designated Place to Orbetello | 5,058.22 mi (8,140.41 km) |
| On Top of the World Designated Place to Oria | 5,415.40 mi (8,715.24 km) |
| On Top of the World Designated Place to Oristano | 5,004.80 mi (8,054.44 km) |
| On Top of the World Designated Place to Orta Nova | 5,299.86 mi (8,529.30 km) |
| On Top of the World Designated Place to Orte | 5,111.97 mi (8,226.92 km) |
| On Top of the World Designated Place to Ortona | 5,207.89 mi (8,381.28 km) |
| On Top of the World Designated Place to Orvieto | 5,091.73 mi (8,194.35 km) |
| On Top of the World Designated Place to Orzinuovi | 4,918.12 mi (7,914.94 km) |
| On Top of the World Designated Place to Osimo | 5,132.01 mi (8,259.17 km) |
| On Top of the World Designated Place to Ospitaletto | 4,920.22 mi (7,918.33 km) |
| On Top of the World Designated Place to Ostuni | 5,405.41 mi (8,699.16 km) |
| On Top of the World Designated Place to Ottaviano | 5,257.63 mi (8,461.34 km) |
| On Top of the World Designated Place to Ovada | 4,880.10 mi (7,853.76 km) |
| On Top of the World Designated Place to Ozieri | 5,005.89 mi (8,056.21 km) |
| On Top of the World Designated Place to Paceco | 5,253.64 mi (8,454.92 km) |
