| Serpa to Nuth | 1,112.41 mi (1,790.24 km) |
| Serpa to Oegstgeest | 1,143.12 mi (1,839.68 km) |
| Serpa to Oirschot | 1,126.91 mi (1,813.59 km) |
| Serpa to Oisterwijk | 1,128.73 mi (1,816.52 km) |
| Serpa to Oldebroek | 1,194.16 mi (1,921.82 km) |
| Serpa to Oldenzaal | 1,214.85 mi (1,955.11 km) |
| Serpa to Ommen | 1,211.38 mi (1,949.53 km) |
| Serpa to Oosterend | 1,228.61 mi (1,977.26 km) |
| Serpa to Oosterhout | 1,122.95 mi (1,807.21 km) |
| Serpa to Oosterwolde | 1,233.63 mi (1,985.34 km) |
| Serpa to Oostzaan | 1,167.41 mi (1,878.77 km) |
| Serpa to Opmeer | 1,184.01 mi (1,905.48 km) |
| Serpa to Oss | 1,147.10 mi (1,846.08 km) |
| Serpa to Oud-Beijerland | 1,120.89 mi (1,803.89 km) |
| Serpa to Oudenbosch | 1,111.36 mi (1,788.57 km) |
