| Fort Mill to Orbetello | 4,741.74 mi (7,631.09 km) |
| Fort Mill to Oria | 5,096.05 mi (8,201.30 km) |
| Fort Mill to Oristano | 4,704.48 mi (7,571.13 km) |
| Fort Mill to Orta Nova | 4,980.53 mi (8,015.39 km) |
| Fort Mill to Orte | 4,793.47 mi (7,714.35 km) |
| Fort Mill to Ortona | 4,886.52 mi (7,864.09 km) |
| Fort Mill to Orvieto | 4,772.56 mi (7,680.70 km) |
| Fort Mill to Orzinuovi | 4,590.56 mi (7,387.79 km) |
| Fort Mill to Osimo | 4,807.35 mi (7,736.68 km) |
| Fort Mill to Ospitaletto | 4,591.80 mi (7,389.79 km) |
| Fort Mill to Ostuni | 5,085.19 mi (8,183.83 km) |
| Fort Mill to Ottaviano | 4,942.54 mi (7,954.24 km) |
| Fort Mill to Ovada | 4,557.73 mi (7,334.95 km) |
| Fort Mill to Ozieri | 4,701.62 mi (7,566.53 km) |
| Fort Mill to Paceco | 4,954.95 mi (7,974.22 km) |
