| North Chicago to Opwijk | 4,116.48 mi (6,624.84 km) |
| North Chicago to Ostend | 4,060.16 mi (6,534.20 km) |
| North Chicago to Oud-Heverlee | 4,139.27 mi (6,661.52 km) |
| North Chicago to Oud-Turnhout | 4,133.64 mi (6,652.45 km) |
| North Chicago to Oudenaarde | 4,098.81 mi (6,596.40 km) |
| North Chicago to Oudenburg | 4,064.66 mi (6,541.43 km) |
| North Chicago to Oupeye | 4,180.12 mi (6,727.25 km) |
| North Chicago to Overijse | 4,136.10 mi (6,656.41 km) |
| North Chicago to Overpelt | 4,153.22 mi (6,683.97 km) |
| North Chicago to Paal | 4,150.64 mi (6,679.81 km) |
| North Chicago to Peer | 4,157.63 mi (6,691.05 km) |
| North Chicago to Pepinster | 4,191.76 mi (6,745.98 km) |
| North Chicago to Peruwelz | 4,109.98 mi (6,614.38 km) |
| North Chicago to Perwez | 4,152.35 mi (6,682.57 km) |
| North Chicago to Philippeville | 4,157.76 mi (6,691.27 km) |
