| Sumter to Oerlinghausen | 4,378.81 mi (7,047.01 km) |
| Sumter to Oestrich-Winkel | 4,403.11 mi (7,086.13 km) |
| Sumter to Offenburg | 4,441.19 mi (7,147.40 km) |
| Sumter to Oftersheim | 4,444.00 mi (7,151.93 km) |
| Sumter to Ohrdruf | 4,491.41 mi (7,228.23 km) |
| Sumter to Ohringen | 4,486.55 mi (7,220.40 km) |
| Sumter to Olbernhau | 4,599.39 mi (7,402.00 km) |
| Sumter to Olching | 4,590.55 mi (7,387.78 km) |
| Sumter to Oldenburg | 4,331.35 mi (6,970.64 km) |
| Sumter to Oldenburg in Holstein | 4,403.26 mi (7,086.37 km) |
| Sumter to Olfen | 4,334.17 mi (6,975.18 km) |
| Sumter to Olpe | 4,369.93 mi (7,032.73 km) |
| Sumter to Olsberg | 4,387.46 mi (7,060.93 km) |
| Sumter to Oranienburg | 4,534.48 mi (7,297.54 km) |
| Sumter to Ortenberg | 4,436.76 mi (7,140.28 km) |
