| Castelli Calepio to Oegstgeest | 515.11 mi (828.99 km) |
| Castelli Calepio to Oirschot | 456.45 mi (734.58 km) |
| Castelli Calepio to Oisterwijk | 463.57 mi (746.04 km) |
| Castelli Calepio to Oldebroek | 504.43 mi (811.80 km) |
| Castelli Calepio to Oldenzaal | 480.87 mi (773.89 km) |
| Castelli Calepio to Ommen | 500.89 mi (806.11 km) |
| Castelli Calepio to Oosterend | 537.51 mi (865.04 km) |
| Castelli Calepio to Oosterhout | 474.53 mi (763.69 km) |
| Castelli Calepio to Oosterwolde | 533.50 mi (858.58 km) |
| Castelli Calepio to Oostzaan | 521.60 mi (839.43 km) |
| Castelli Calepio to Opmeer | 536.72 mi (863.77 km) |
| Castelli Calepio to Oss | 468.34 mi (753.72 km) |
| Castelli Calepio to Oud-Beijerland | 495.02 mi (796.66 km) |
| Castelli Calepio to Oudenbosch | 478.92 mi (770.75 km) |
| Castelli Calepio to Oudewater | 496.65 mi (799.28 km) |
