| West Columbia to Orbetello | 4,791.61 mi (7,711.34 km) |
| West Columbia to Oria | 5,146.59 mi (8,282.64 km) |
| West Columbia to Oristano | 4,751.31 mi (7,646.49 km) |
| West Columbia to Orta Nova | 5,031.02 mi (8,096.65 km) |
| West Columbia to Orte | 4,843.74 mi (7,795.25 km) |
| West Columbia to Ortona | 4,937.36 mi (7,945.92 km) |
| West Columbia to Orvieto | 4,822.95 mi (7,761.79 km) |
| West Columbia to Orzinuovi | 4,642.46 mi (7,471.33 km) |
| West Columbia to Osimo | 4,858.78 mi (7,819.45 km) |
| West Columbia to Ospitaletto | 4,643.87 mi (7,473.58 km) |
| West Columbia to Ostuni | 5,135.89 mi (8,265.42 km) |
| West Columbia to Ottaviano | 4,992.22 mi (8,034.21 km) |
| West Columbia to Ovada | 4,608.64 mi (7,416.88 km) |
| West Columbia to Ozieri | 4,749.19 mi (7,643.08 km) |
| West Columbia to Paceco | 5,001.59 mi (8,049.27 km) |
