| Opelousas to Opwijk | 4,864.63 mi (7,828.87 km) |
| Opelousas to Ostend | 4,807.27 mi (7,736.56 km) |
| Opelousas to Oud-Heverlee | 4,887.62 mi (7,865.87 km) |
| Opelousas to Oud-Turnhout | 4,885.93 mi (7,863.14 km) |
| Opelousas to Oudenaarde | 4,844.84 mi (7,797.02 km) |
| Opelousas to Oudenburg | 4,811.65 mi (7,743.60 km) |
| Opelousas to Oupeye | 4,929.87 mi (7,933.86 km) |
| Opelousas to Overijse | 4,883.80 mi (7,859.72 km) |
| Opelousas to Overpelt | 4,905.82 mi (7,895.16 km) |
| Opelousas to Paal | 4,901.52 mi (7,888.23 km) |
| Opelousas to Peer | 4,909.76 mi (7,901.49 km) |
| Opelousas to Pepinster | 4,940.98 mi (7,951.74 km) |
| Opelousas to Peruwelz | 4,853.67 mi (7,811.22 km) |
| Opelousas to Perwez | 4,899.63 mi (7,885.19 km) |
| Opelousas to Philippeville | 4,901.53 mi (7,888.25 km) |
