| Hardenberg to Butzbach | 171.44 mi (275.91 km) |
| Hardenberg to Buxtehude | 142.77 mi (229.76 km) |
| Hardenberg to Cadolzburg | 283.64 mi (456.48 km) |
| Hardenberg to Calbe | 223.01 mi (358.90 km) |
| Hardenberg to Calw | 281.68 mi (453.32 km) |
| Hardenberg to Castrop-Rauxel | 76.28 mi (122.76 km) |
| Hardenberg to Celle | 145.50 mi (234.16 km) |
| Hardenberg to Cham | 350.10 mi (563.43 km) |
| Hardenberg to Chemnitz | 295.04 mi (474.82 km) |
| Hardenberg to Clausthal-Zellerfeld | 166.07 mi (267.27 km) |
| Hardenberg to Cloppenburg | 63.11 mi (101.57 km) |
| Hardenberg to Coburg | 245.66 mi (395.36 km) |
| Hardenberg to Coesfeld | 48.55 mi (78.13 km) |
| Hardenberg to Cologne | 113.56 mi (182.75 km) |
| Hardenberg to Coswig | 313.25 mi (504.12 km) |
