| Cologno al Serio to Oegstgeest | 513.96 mi (827.14 km) |
| Cologno al Serio to Oirschot | 455.46 mi (733.00 km) |
| Cologno al Serio to Oisterwijk | 462.56 mi (744.42 km) |
| Cologno al Serio to Oldebroek | 504.54 mi (811.98 km) |
| Cologno al Serio to Oldenzaal | 481.78 mi (775.35 km) |
| Cologno al Serio to Ommen | 501.46 mi (807.02 km) |
| Cologno al Serio to Oosterend | 538.02 mi (865.86 km) |
| Cologno al Serio to Oosterhout | 473.30 mi (761.70 km) |
| Cologno al Serio to Oosterwolde | 534.17 mi (859.67 km) |
| Cologno al Serio to Oostzaan | 520.92 mi (838.34 km) |
| Cologno al Serio to Opmeer | 536.25 mi (863.02 km) |
| Cologno al Serio to Oss | 467.73 mi (752.74 km) |
| Cologno al Serio to Oud-Beijerland | 493.56 mi (794.30 km) |
| Cologno al Serio to Oudenbosch | 477.38 mi (768.27 km) |
| Cologno al Serio to Oudewater | 495.69 mi (797.73 km) |
