| Portage to Nuth | 4,102.51 mi (6,602.35 km) |
| Portage to Oegstgeest | 4,006.15 mi (6,447.28 km) |
| Portage to Oirschot | 4,060.38 mi (6,534.54 km) |
| Portage to Oisterwijk | 4,053.78 mi (6,523.93 km) |
| Portage to Oldebroek | 4,049.79 mi (6,517.51 km) |
| Portage to Oldenzaal | 4,092.09 mi (6,585.59 km) |
| Portage to Ommen | 4,066.32 mi (6,544.12 km) |
| Portage to Oosterend | 4,036.87 mi (6,496.71 km) |
| Portage to Oosterhout | 4,038.95 mi (6,500.06 km) |
| Portage to Oosterwolde | 4,045.45 mi (6,510.52 km) |
| Portage to Oostzaan | 4,013.10 mi (6,458.46 km) |
| Portage to Opmeer | 4,006.57 mi (6,447.95 km) |
| Portage to Oss | 4,059.22 mi (6,532.69 km) |
| Portage to Oud-Beijerland | 4,016.03 mi (6,463.17 km) |
| Portage to Oudenbosch | 4,028.36 mi (6,483.02 km) |
