| Grottaglie to Oegstgeest | 1,011.78 mi (1,628.30 km) |
| Grottaglie to Oirschot | 952.91 mi (1,533.57 km) |
| Grottaglie to Oisterwijk | 960.07 mi (1,545.08 km) |
| Grottaglie to Oldebroek | 986.74 mi (1,588.01 km) |
| Grottaglie to Oldenzaal | 953.28 mi (1,534.16 km) |
| Grottaglie to Ommen | 977.25 mi (1,572.74 km) |
| Grottaglie to Oosterend | 1,013.03 mi (1,630.31 km) |
| Grottaglie to Oosterhout | 973.05 mi (1,565.98 km) |
| Grottaglie to Oosterwolde | 1,006.78 mi (1,620.26 km) |
| Grottaglie to Oostzaan | 1,013.02 mi (1,630.30 km) |
| Grottaglie to Opmeer | 1,025.26 mi (1,650.00 km) |
| Grottaglie to Oss | 960.58 mi (1,545.91 km) |
| Grottaglie to Oud-Beijerland | 995.18 mi (1,601.59 km) |
| Grottaglie to Oudenbosch | 980.15 mi (1,577.41 km) |
| Grottaglie to Oudewater | 991.85 mi (1,596.23 km) |
