| Oak Ridge to Opwijk | 4,282.62 mi (6,892.22 km) |
| Oak Ridge to Ostend | 4,225.16 mi (6,799.73 km) |
| Oak Ridge to Oud-Heverlee | 4,305.62 mi (6,929.22 km) |
| Oak Ridge to Oud-Turnhout | 4,304.62 mi (6,927.62 km) |
| Oak Ridge to Oudenaarde | 4,262.51 mi (6,859.84 km) |
| Oak Ridge to Oudenburg | 4,229.51 mi (6,806.73 km) |
| Oak Ridge to Oupeye | 4,348.06 mi (6,997.52 km) |
| Oak Ridge to Overijse | 4,301.69 mi (6,922.91 km) |
| Oak Ridge to Overpelt | 4,324.55 mi (6,959.69 km) |
| Oak Ridge to Paal | 4,319.93 mi (6,952.26 km) |
| Oak Ridge to Peer | 4,328.39 mi (6,965.87 km) |
| Oak Ridge to Pepinster | 4,359.06 mi (7,015.22 km) |
| Oak Ridge to Peruwelz | 4,270.96 mi (6,873.45 km) |
| Oak Ridge to Perwez | 4,317.43 mi (6,948.23 km) |
| Oak Ridge to Philippeville | 4,318.78 mi (6,950.40 km) |
