| Rockford to Opwijk | 4,163.97 mi (6,701.27 km) |
| Rockford to Ostend | 4,107.80 mi (6,610.87 km) |
| Rockford to Oud-Heverlee | 4,186.73 mi (6,737.89 km) |
| Rockford to Oud-Turnhout | 4,180.68 mi (6,728.15 km) |
| Rockford to Oudenaarde | 4,146.53 mi (6,673.20 km) |
| Rockford to Oudenburg | 4,112.30 mi (6,618.11 km) |
| Rockford to Oupeye | 4,227.39 mi (6,803.33 km) |
| Rockford to Overijse | 4,183.62 mi (6,732.89 km) |
| Rockford to Overpelt | 4,200.22 mi (6,759.60 km) |
| Rockford to Paal | 4,197.82 mi (6,755.74 km) |
| Rockford to Peer | 4,204.67 mi (6,766.76 km) |
| Rockford to Pepinster | 4,239.08 mi (6,822.15 km) |
| Rockford to Peruwelz | 4,157.93 mi (6,691.55 km) |
| Rockford to Perwez | 4,199.91 mi (6,759.10 km) |
| Rockford to Philippeville | 4,205.67 mi (6,768.37 km) |
