| Ariano Irpino to Oegstgeest | 911.42 mi (1,466.78 km) |
| Ariano Irpino to Oirschot | 852.31 mi (1,371.65 km) |
| Ariano Irpino to Oisterwijk | 859.49 mi (1,383.21 km) |
| Ariano Irpino to Oldebroek | 891.76 mi (1,435.15 km) |
| Ariano Irpino to Oldenzaal | 861.35 mi (1,386.21 km) |
| Ariano Irpino to Ommen | 884.26 mi (1,423.07 km) |
| Ariano Irpino to Oosterend | 920.65 mi (1,481.65 km) |
| Ariano Irpino to Oosterhout | 871.70 mi (1,402.86 km) |
| Ariano Irpino to Oosterwolde | 915.11 mi (1,472.73 km) |
| Ariano Irpino to Oostzaan | 914.82 mi (1,472.25 km) |
| Ariano Irpino to Opmeer | 928.26 mi (1,493.89 km) |
| Ariano Irpino to Oss | 861.71 mi (1,386.79 km) |
| Ariano Irpino to Oud-Beijerland | 893.22 mi (1,437.49 km) |
| Ariano Irpino to Oudenbosch | 877.64 mi (1,412.42 km) |
| Ariano Irpino to Oudewater | 892.00 mi (1,435.53 km) |
