| Knoxville to Oerlinghausen | 4,415.38 mi (7,105.87 km) |
| Knoxville to Oestrich-Winkel | 4,448.94 mi (7,159.88 km) |
| Knoxville to Offenburg | 4,493.59 mi (7,231.73 km) |
| Knoxville to Oftersheim | 4,491.76 mi (7,228.79 km) |
| Knoxville to Ohrdruf | 4,530.30 mi (7,290.82 km) |
| Knoxville to Ohringen | 4,533.84 mi (7,296.51 km) |
| Knoxville to Olbernhau | 4,635.54 mi (7,460.17 km) |
| Knoxville to Olching | 4,639.52 mi (7,466.58 km) |
| Knoxville to Oldenburg | 4,363.32 mi (7,022.08 km) |
| Knoxville to Oldenburg in Holstein | 4,427.18 mi (7,124.86 km) |
| Knoxville to Olfen | 4,373.33 mi (7,038.20 km) |
| Knoxville to Olpe | 4,411.60 mi (7,099.79 km) |
| Knoxville to Olsberg | 4,426.91 mi (7,124.43 km) |
| Knoxville to Oranienburg | 4,562.13 mi (7,342.04 km) |
| Knoxville to Ortenberg | 4,479.77 mi (7,209.49 km) |
