| Sumter to Oberkirch | 4,445.71 mi (7,154.67 km) |
| Sumter to Obernburg am Main | 4,454.21 mi (7,168.36 km) |
| Sumter to Obernkirchen | 4,388.81 mi (7,063.10 km) |
| Sumter to Oberschleissheim | 4,599.48 mi (7,402.15 km) |
| Sumter to Oberstdorf | 4,570.06 mi (7,354.81 km) |
| Sumter to Obertraubling | 4,603.03 mi (7,407.87 km) |
| Sumter to Obertshausen | 4,435.48 mi (7,138.22 km) |
| Sumter to Oberursel | 4,421.36 mi (7,115.49 km) |
| Sumter to Ochsenfurt | 4,497.33 mi (7,237.76 km) |
| Sumter to Ochsenhausen | 4,536.98 mi (7,301.57 km) |
| Sumter to Ochtrup | 4,314.42 mi (6,943.38 km) |
| Sumter to Odenthal | 4,340.55 mi (6,985.43 km) |
| Sumter to Oelde | 4,361.76 mi (7,019.58 km) |
| Sumter to Oelsnitz | 4,560.40 mi (7,339.25 km) |
| Sumter to Oer-Erkenschwick | 4,330.73 mi (6,969.64 km) |
