| San Giovanni Rotondo to Oegstgeest | 896.17 mi (1,442.25 km) |
| San Giovanni Rotondo to Oirschot | 837.16 mi (1,347.28 km) |
| San Giovanni Rotondo to Oisterwijk | 844.33 mi (1,358.82 km) |
| San Giovanni Rotondo to Oldebroek | 873.32 mi (1,405.47 km) |
| San Giovanni Rotondo to Oldenzaal | 841.19 mi (1,353.77 km) |
| San Giovanni Rotondo to Ommen | 864.71 mi (1,391.61 km) |
| San Giovanni Rotondo to Oosterend | 900.81 mi (1,449.71 km) |
| San Giovanni Rotondo to Oosterhout | 857.04 mi (1,379.28 km) |
| San Giovanni Rotondo to Oosterwolde | 894.88 mi (1,440.17 km) |
| San Giovanni Rotondo to Oostzaan | 898.27 mi (1,445.62 km) |
| San Giovanni Rotondo to Opmeer | 911.01 mi (1,466.13 km) |
| San Giovanni Rotondo to Oss | 845.51 mi (1,360.71 km) |
| San Giovanni Rotondo to Oud-Beijerland | 878.97 mi (1,414.57 km) |
| San Giovanni Rotondo to Oudenbosch | 863.73 mi (1,390.04 km) |
| San Giovanni Rotondo to Oudewater | 876.42 mi (1,410.47 km) |
