| Oulu to Opwijk | 1,232.27 mi (1,983.15 km) |
| Oulu to Ostend | 1,244.99 mi (2,003.62 km) |
| Oulu to Oud-Heverlee | 1,229.83 mi (1,979.22 km) |
| Oulu to Oud-Turnhout | 1,194.00 mi (1,921.56 km) |
| Oulu to Oudenaarde | 1,252.03 mi (2,014.95 km) |
| Oulu to Oudenburg | 1,245.67 mi (2,004.72 km) |
| Oulu to Oupeye | 1,216.82 mi (1,958.29 km) |
| Oulu to Overijse | 1,235.70 mi (1,988.67 km) |
| Oulu to Overpelt | 1,190.77 mi (1,916.36 km) |
| Oulu to Paal | 1,206.64 mi (1,941.90 km) |
| Oulu to Peer | 1,195.05 mi (1,923.25 km) |
| Oulu to Pepinster | 1,221.88 mi (1,966.42 km) |
| Oulu to Peruwelz | 1,272.31 mi (2,047.59 km) |
| Oulu to Perwez | 1,239.29 mi (1,994.45 km) |
| Oulu to Philippeville | 1,270.60 mi (2,044.83 km) |
