| Altopascio to Oegstgeest | 645.01 mi (1,038.05 km) |
| Altopascio to Oirschot | 586.62 mi (944.07 km) |
| Altopascio to Oisterwijk | 593.71 mi (955.48 km) |
| Altopascio to Oldebroek | 635.62 mi (1,022.94 km) |
| Altopascio to Oldenzaal | 612.07 mi (985.03 km) |
| Altopascio to Ommen | 632.16 mi (1,017.37 km) |
| Altopascio to Oosterend | 668.78 mi (1,076.30 km) |
| Altopascio to Oosterhout | 604.29 mi (972.51 km) |
| Altopascio to Oosterwolde | 664.76 mi (1,069.82 km) |
| Altopascio to Oostzaan | 652.17 mi (1,049.56 km) |
| Altopascio to Opmeer | 667.52 mi (1,074.27 km) |
| Altopascio to Oss | 598.99 mi (963.98 km) |
| Altopascio to Oud-Beijerland | 624.36 mi (1,004.81 km) |
| Altopascio to Oudenbosch | 608.11 mi (978.66 km) |
| Altopascio to Oudewater | 626.84 mi (1,008.80 km) |
