| Clay to Nuth | 4,555.45 mi (7,331.29 km) |
| Clay to Oegstgeest | 4,464.54 mi (7,184.99 km) |
| Clay to Oirschot | 4,515.93 mi (7,267.69 km) |
| Clay to Oisterwijk | 4,509.68 mi (7,257.63 km) |
| Clay to Oldebroek | 4,512.79 mi (7,262.63 km) |
| Clay to Oldenzaal | 4,556.31 mi (7,332.67 km) |
| Clay to Ommen | 4,530.78 mi (7,291.58 km) |
| Clay to Oosterend | 4,503.75 mi (7,248.08 km) |
| Clay to Oosterhout | 4,494.54 mi (7,233.26 km) |
| Clay to Oosterwolde | 4,512.68 mi (7,262.46 km) |
| Clay to Oostzaan | 4,473.97 mi (7,200.16 km) |
| Clay to Opmeer | 4,469.32 mi (7,192.67 km) |
| Clay to Oss | 4,516.99 mi (7,269.39 km) |
| Clay to Oud-Beijerland | 4,471.84 mi (7,196.73 km) |
| Clay to Oudenbosch | 4,482.90 mi (7,214.53 km) |
