| Port Royal to Nuth | 4,383.30 mi (7,054.23 km) |
| Port Royal to Oegstgeest | 4,297.59 mi (6,916.31 km) |
| Port Royal to Oirschot | 4,346.23 mi (6,994.57 km) |
| Port Royal to Oisterwijk | 4,340.31 mi (6,985.05 km) |
| Port Royal to Oldebroek | 4,349.26 mi (6,999.46 km) |
| Port Royal to Oldenzaal | 4,393.45 mi (7,070.57 km) |
| Port Royal to Ommen | 4,368.33 mi (7,030.15 km) |
| Port Royal to Oosterend | 4,343.60 mi (6,990.35 km) |
| Port Royal to Oosterhout | 4,325.04 mi (6,960.47 km) |
| Port Royal to Oosterwolde | 4,352.76 mi (7,005.09 km) |
| Port Royal to Oostzaan | 4,309.00 mi (6,934.66 km) |
| Port Royal to Opmeer | 4,305.96 mi (6,929.77 km) |
| Port Royal to Oss | 4,349.08 mi (6,999.16 km) |
| Port Royal to Oud-Beijerland | 4,302.71 mi (6,924.54 km) |
| Port Royal to Oudenbosch | 4,312.65 mi (6,940.53 km) |
