| Hartsville to Orbetello | 4,911.47 mi (7,904.24 km) |
| Hartsville to Oria | 5,261.31 mi (8,467.26 km) |
| Hartsville to Oristano | 4,889.12 mi (7,868.28 km) |
| Hartsville to Orta Nova | 5,146.34 mi (8,282.23 km) |
| Hartsville to Orte | 4,961.00 mi (7,983.96 km) |
| Hartsville to Ortona | 5,050.76 mi (8,128.41 km) |
| Hartsville to Orvieto | 4,939.53 mi (7,949.40 km) |
| Hartsville to Orzinuovi | 4,749.96 mi (7,644.33 km) |
| Hartsville to Osimo | 4,968.66 mi (7,996.28 km) |
| Hartsville to Ospitaletto | 4,750.29 mi (7,644.85 km) |
| Hartsville to Ostuni | 5,249.64 mi (8,448.49 km) |
| Hartsville to Ottaviano | 5,112.63 mi (8,227.98 km) |
| Hartsville to Ovada | 4,722.59 mi (7,600.27 km) |
| Hartsville to Ozieri | 4,882.83 mi (7,858.15 km) |
| Hartsville to Paceco | 5,139.82 mi (8,271.74 km) |
