| Hardenberg to Isny im Allgau | 369.26 mi (594.26 km) |
| Hardenberg to Isselburg | 51.08 mi (82.21 km) |
| Hardenberg to Issum | 71.49 mi (115.05 km) |
| Hardenberg to Itzehoe | 152.23 mi (244.99 km) |
| Hardenberg to Jena | 240.81 mi (387.54 km) |
| Hardenberg to Jever | 87.69 mi (141.12 km) |
| Hardenberg to Jork | 143.77 mi (231.38 km) |
| Hardenberg to Juchen | 101.38 mi (163.16 km) |
| Hardenberg to Julich | 114.16 mi (183.72 km) |
| Hardenberg to Juterbog | 275.67 mi (443.65 km) |
| Hardenberg to Kaarst | 93.28 mi (150.11 km) |
| Hardenberg to Kaiserslautern | 221.44 mi (356.38 km) |
| Hardenberg to Kalkar | 58.82 mi (94.67 km) |
| Hardenberg to Kall | 139.39 mi (224.33 km) |
| Hardenberg to Kaltenkirchen | 163.94 mi (263.83 km) |
