| Boulogne-sur-Mer to Juprelle | 171.39 mi (275.83 km) |
| Boulogne-sur-Mer to Jurbise | 102.49 mi (164.94 km) |
| Boulogne-sur-Mer to Kalmthout | 131.91 mi (212.28 km) |
| Boulogne-sur-Mer to Kampenhout | 128.92 mi (207.48 km) |
| Boulogne-sur-Mer to Kapelle-op-den-Bos | 121.65 mi (195.78 km) |
| Boulogne-sur-Mer to Kapellen | 129.10 mi (207.77 km) |
| Boulogne-sur-Mer to Kasterlee | 149.49 mi (240.58 km) |
| Boulogne-sur-Mer to Keerbergen | 132.91 mi (213.90 km) |
| Boulogne-sur-Mer to Kinrooi | 181.93 mi (292.78 km) |
| Boulogne-sur-Mer to Knokke-Heist | 84.17 mi (135.45 km) |
| Boulogne-sur-Mer to Koekelare | 64.60 mi (103.96 km) |
| Boulogne-sur-Mer to Koekelberg | 119.12 mi (191.70 km) |
| Boulogne-sur-Mer to Koksijde | 51.96 mi (83.63 km) |
| Boulogne-sur-Mer to Kontich | 126.62 mi (203.78 km) |
| Boulogne-sur-Mer to Kortemark | 65.73 mi (105.79 km) |
