| Groslay to Novi di Modena | 492.40 mi (792.43 km) |
| Groslay to Novi Ligure | 421.48 mi (678.30 km) |
| Groslay to Nuoro | 689.85 mi (1,110.21 km) |
| Groslay to Occhiobello | 517.77 mi (833.27 km) |
| Groslay to Oderzo | 523.33 mi (842.22 km) |
| Groslay to Oggiono | 395.21 mi (636.04 km) |
| Groslay to Olbia | 657.60 mi (1,058.30 km) |
| Groslay to Oleggio | 376.10 mi (605.27 km) |
| Groslay to Olgiate Comasco | 380.51 mi (612.38 km) |
| Groslay to Olgiate Olona | 383.86 mi (617.76 km) |
| Groslay to Omegna | 355.37 mi (571.92 km) |
| Groslay to Opera | 407.32 mi (655.51 km) |
| Groslay to Oppeano | 486.80 mi (783.44 km) |
| Groslay to Orbassano | 367.89 mi (592.06 km) |
| Groslay to Orbetello | 621.83 mi (1,000.74 km) |
