| Grammichele to Oegstgeest | 1,145.93 mi (1,844.20 km) |
| Grammichele to Oirschot | 1,087.40 mi (1,749.99 km) |
| Grammichele to Oisterwijk | 1,094.50 mi (1,761.43 km) |
| Grammichele to Oldebroek | 1,134.40 mi (1,825.64 km) |
| Grammichele to Oldenzaal | 1,108.24 mi (1,783.53 km) |
| Grammichele to Ommen | 1,129.54 mi (1,817.82 km) |
| Grammichele to Oosterend | 1,166.23 mi (1,876.86 km) |
| Grammichele to Oosterhout | 1,105.25 mi (1,778.73 km) |
| Grammichele to Oosterwolde | 1,161.61 mi (1,869.42 km) |
| Grammichele to Oostzaan | 1,152.60 mi (1,854.93 km) |
| Grammichele to Opmeer | 1,167.61 mi (1,879.08 km) |
| Grammichele to Oss | 1,099.32 mi (1,769.19 km) |
| Grammichele to Oud-Beijerland | 1,125.39 mi (1,811.14 km) |
| Grammichele to Oudenbosch | 1,109.14 mi (1,784.99 km) |
| Grammichele to Oudewater | 1,127.61 mi (1,814.71 km) |
