| Fort Oglethorpe to Orbetello | 4,935.84 mi (7,943.47 km) |
| Fort Oglethorpe to Oria | 5,287.78 mi (8,509.86 km) |
| Fort Oglethorpe to Oristano | 4,906.96 mi (7,897.00 km) |
| Fort Oglethorpe to Orta Nova | 5,172.51 mi (8,324.36 km) |
| Fort Oglethorpe to Orte | 4,986.34 mi (8,024.74 km) |
| Fort Oglethorpe to Ortona | 5,077.54 mi (8,171.51 km) |
| Fort Oglethorpe to Orvieto | 4,965.10 mi (7,990.55 km) |
| Fort Oglethorpe to Orzinuovi | 4,778.57 mi (7,690.36 km) |
| Fort Oglethorpe to Osimo | 4,996.61 mi (8,041.27 km) |
| Fort Oglethorpe to Ospitaletto | 4,779.27 mi (7,691.49 km) |
| Fort Oglethorpe to Ostuni | 5,276.45 mi (8,491.63 km) |
| Fort Oglethorpe to Ottaviano | 5,136.97 mi (8,267.15 km) |
| Fort Oglethorpe to Ovada | 4,748.91 mi (7,642.64 km) |
| Fort Oglethorpe to Ozieri | 4,902.20 mi (7,889.33 km) |
| Fort Oglethorpe to Paceco | 5,157.69 mi (8,300.51 km) |
