| Knoxville to Opwijk | 4,268.63 mi (6,869.69 km) |
| Knoxville to Ostend | 4,211.14 mi (6,777.18 km) |
| Knoxville to Oud-Heverlee | 4,291.62 mi (6,906.70 km) |
| Knoxville to Oud-Turnhout | 4,290.77 mi (6,905.32 km) |
| Knoxville to Oudenaarde | 4,248.45 mi (6,837.22 km) |
| Knoxville to Oudenburg | 4,215.49 mi (6,784.17 km) |
| Knoxville to Oupeye | 4,334.10 mi (6,975.05 km) |
| Knoxville to Overijse | 4,287.68 mi (6,900.35 km) |
| Knoxville to Overpelt | 4,310.70 mi (6,937.40 km) |
| Knoxville to Paal | 4,306.02 mi (6,929.87 km) |
| Knoxville to Peer | 4,314.52 mi (6,943.55 km) |
| Knoxville to Pepinster | 4,345.08 mi (6,992.73 km) |
| Knoxville to Peruwelz | 4,256.82 mi (6,850.69 km) |
| Knoxville to Perwez | 4,303.40 mi (6,925.65 km) |
| Knoxville to Philippeville | 4,304.63 mi (6,927.63 km) |
