| Boulogne-sur-Mer to Mouscron | 70.06 mi (112.76 km) |
| Boulogne-sur-Mer to Namur | 143.74 mi (231.33 km) |
| Boulogne-sur-Mer to Neder-Over-Heembeek | 121.45 mi (195.46 km) |
| Boulogne-sur-Mer to Neerpelt | 169.74 mi (273.17 km) |
| Boulogne-sur-Mer to Nevele | 86.99 mi (140.00 km) |
| Boulogne-sur-Mer to Niel | 121.43 mi (195.43 km) |
| Boulogne-sur-Mer to Nieuwpoort | 56.32 mi (90.64 km) |
| Boulogne-sur-Mer to Nijlen | 135.58 mi (218.19 km) |
| Boulogne-sur-Mer to Ninove | 105.19 mi (169.29 km) |
| Boulogne-sur-Mer to Nivelles | 118.77 mi (191.13 km) |
| Boulogne-sur-Mer to Olen | 143.86 mi (231.52 km) |
| Boulogne-sur-Mer to Oostakker | 97.23 mi (156.48 km) |
| Boulogne-sur-Mer to Oosterzele | 96.59 mi (155.45 km) |
| Boulogne-sur-Mer to Oostkamp | 76.50 mi (123.12 km) |
| Boulogne-sur-Mer to Opglabbeek | 174.39 mi (280.66 km) |
