| Knoxville to Octeville | 4,064.42 mi (6,541.05 km) |
| Knoxville to Oignies | 4,234.25 mi (6,814.36 km) |
| Knoxville to Oissel | 4,185.92 mi (6,736.59 km) |
| Knoxville to Olivet | 4,259.66 mi (6,855.26 km) |
| Knoxville to Ollioules | 4,573.25 mi (7,359.93 km) |
| Knoxville to Olonne-sur-Mer | 4,136.06 mi (6,656.35 km) |
| Knoxville to Oloron-Sainte-Marie | 4,279.50 mi (6,887.19 km) |
| Knoxville to Onet Village | 4,390.15 mi (7,065.26 km) |
| Knoxville to Onnaing | 4,260.93 mi (6,857.31 km) |
| Knoxville to Orange | 4,495.50 mi (7,234.81 km) |
| Knoxville to Orchies | 4,244.25 mi (6,830.46 km) |
| Knoxville to Orleans | 4,258.95 mi (6,854.12 km) |
| Knoxville to Orly | 4,256.26 mi (6,849.79 km) |
| Knoxville to Ormesson-sur-Marne | 4,261.20 mi (6,857.73 km) |
| Knoxville to Orsay | 4,248.92 mi (6,837.97 km) |
