| Boulogne-sur-Mer to Isselburg | 223.15 mi (359.13 km) |
| Boulogne-sur-Mer to Issum | 215.88 mi (347.43 km) |
| Boulogne-sur-Mer to Itzehoe | 399.87 mi (643.52 km) |
| Boulogne-sur-Mer to Jena | 435.08 mi (700.19 km) |
| Boulogne-sur-Mer to Jever | 331.08 mi (532.82 km) |
| Boulogne-sur-Mer to Jork | 393.00 mi (632.48 km) |
| Boulogne-sur-Mer to Juchen | 214.42 mi (345.07 km) |
| Boulogne-sur-Mer to Julich | 207.45 mi (333.85 km) |
| Boulogne-sur-Mer to Juterbog | 501.48 mi (807.06 km) |
| Boulogne-sur-Mer to Kaarst | 220.21 mi (354.39 km) |
| Boulogne-sur-Mer to Kaiserslautern | 286.75 mi (461.47 km) |
| Boulogne-sur-Mer to Kalkar | 214.08 mi (344.53 km) |
| Boulogne-sur-Mer to Kall | 216.56 mi (348.51 km) |
| Boulogne-sur-Mer to Kaltenkirchen | 412.78 mi (664.30 km) |
| Boulogne-sur-Mer to Kamen | 268.83 mi (432.64 km) |
