| Mountain Top to Orbetello | 4,273.01 mi (6,876.75 km) |
| Mountain Top to Oria | 4,624.26 mi (7,442.02 km) |
| Mountain Top to Oristano | 4,247.99 mi (6,836.48 km) |
| Mountain Top to Orta Nova | 4,509.07 mi (7,256.64 km) |
| Mountain Top to Orte | 4,323.15 mi (6,957.44 km) |
| Mountain Top to Ortona | 4,413.91 mi (7,103.50 km) |
| Mountain Top to Orvieto | 4,301.82 mi (6,923.12 km) |
| Mountain Top to Orzinuovi | 4,114.53 mi (6,621.69 km) |
| Mountain Top to Osimo | 4,332.70 mi (6,972.80 km) |
| Mountain Top to Ospitaletto | 4,115.17 mi (6,622.73 km) |
| Mountain Top to Ostuni | 4,612.83 mi (7,423.63 km) |
| Mountain Top to Ottaviano | 4,474.17 mi (7,200.48 km) |
| Mountain Top to Ovada | 4,085.38 mi (6,574.79 km) |
| Mountain Top to Ozieri | 4,242.10 mi (6,827.01 km) |
| Mountain Top to Paceco | 4,498.72 mi (7,239.98 km) |
