| Rockford to Nuth | 4,228.44 mi (6,805.02 km) |
| Rockford to Oegstgeest | 4,130.47 mi (6,647.35 km) |
| Rockford to Oirschot | 4,185.53 mi (6,735.96 km) |
| Rockford to Oisterwijk | 4,178.83 mi (6,725.18 km) |
| Rockford to Oldebroek | 4,172.35 mi (6,714.76 km) |
| Rockford to Oldenzaal | 4,214.10 mi (6,781.94 km) |
| Rockford to Ommen | 4,188.31 mi (6,740.44 km) |
| Rockford to Oosterend | 4,158.05 mi (6,691.73 km) |
| Rockford to Oosterhout | 4,164.15 mi (6,701.56 km) |
| Rockford to Oosterwolde | 4,166.48 mi (6,705.29 km) |
| Rockford to Oostzaan | 4,136.52 mi (6,657.09 km) |
| Rockford to Opmeer | 4,129.33 mi (6,645.52 km) |
| Rockford to Oss | 4,183.62 mi (6,732.88 km) |
| Rockford to Oud-Beijerland | 4,141.21 mi (6,664.64 km) |
| Rockford to Oudenbosch | 4,153.95 mi (6,685.13 km) |
