| Warren to Nuth | 3,992.13 mi (6,424.72 km) |
| Warren to Oegstgeest | 3,896.81 mi (6,271.30 km) |
| Warren to Oirschot | 3,950.49 mi (6,357.71 km) |
| Warren to Oisterwijk | 3,943.96 mi (6,347.20 km) |
| Warren to Oldebroek | 3,941.47 mi (6,343.19 km) |
| Warren to Oldenzaal | 3,984.08 mi (6,411.76 km) |
| Warren to Ommen | 3,958.34 mi (6,370.33 km) |
| Warren to Oosterend | 3,929.39 mi (6,323.75 km) |
| Warren to Oosterhout | 3,929.05 mi (6,323.20 km) |
| Warren to Oosterwolde | 3,938.06 mi (6,337.70 km) |
| Warren to Oostzaan | 3,904.29 mi (6,283.35 km) |
| Warren to Opmeer | 3,898.15 mi (6,273.47 km) |
| Warren to Oss | 3,949.80 mi (6,356.59 km) |
| Warren to Oud-Beijerland | 3,906.15 mi (6,286.35 km) |
| Warren to Oudenbosch | 3,918.24 mi (6,305.79 km) |
