| Atherton to Orbetello | 990.66 mi (1,594.31 km) |
| Atherton to Oria | 1,298.70 mi (2,090.06 km) |
| Atherton to Oristano | 1,074.66 mi (1,729.49 km) |
| Atherton to Orta Nova | 1,190.85 mi (1,916.48 km) |
| Atherton to Orte | 1,024.37 mi (1,648.56 km) |
| Atherton to Ortona | 1,093.63 mi (1,760.03 km) |
| Atherton to Orvieto | 1,001.69 mi (1,612.07 km) |
| Atherton to Orzinuovi | 789.39 mi (1,270.40 km) |
| Atherton to Osimo | 1,003.83 mi (1,615.51 km) |
| Atherton to Ospitaletto | 785.66 mi (1,264.40 km) |
| Atherton to Ostuni | 1,284.61 mi (2,067.38 km) |
| Atherton to Ottaviano | 1,178.01 mi (1,895.82 km) |
| Atherton to Ovada | 792.46 mi (1,275.34 km) |
| Atherton to Ozieri | 1,042.11 mi (1,677.12 km) |
| Atherton to Paceco | 1,289.91 mi (2,075.91 km) |
