| Boulogne-sur-Mer to Novi di Modena | 589.18 mi (948.20 km) |
| Boulogne-sur-Mer to Novi Ligure | 529.57 mi (852.27 km) |
| Boulogne-sur-Mer to Nuoro | 809.47 mi (1,302.71 km) |
| Boulogne-sur-Mer to Occhiobello | 611.13 mi (983.51 km) |
| Boulogne-sur-Mer to Oderzo | 605.02 mi (973.68 km) |
| Boulogne-sur-Mer to Oggiono | 492.74 mi (792.99 km) |
| Boulogne-sur-Mer to Olbia | 775.86 mi (1,248.63 km) |
| Boulogne-sur-Mer to Oleggio | 479.25 mi (771.28 km) |
| Boulogne-sur-Mer to Olgiate Comasco | 480.22 mi (772.84 km) |
| Boulogne-sur-Mer to Olgiate Olona | 485.32 mi (781.05 km) |
| Boulogne-sur-Mer to Omegna | 457.52 mi (736.31 km) |
| Boulogne-sur-Mer to Opera | 508.95 mi (819.07 km) |
| Boulogne-sur-Mer to Oppeano | 578.99 mi (931.80 km) |
| Boulogne-sur-Mer to Orbassano | 480.80 mi (773.77 km) |
| Boulogne-sur-Mer to Orbetello | 730.58 mi (1,175.75 km) |
