| Alpena to Butzbach | 4,010.18 mi (6,453.76 km) |
| Alpena to Buxtehude | 3,932.15 mi (6,328.18 km) |
| Alpena to Cadolzburg | 4,129.57 mi (6,645.90 km) |
| Alpena to Calbe | 4,064.76 mi (6,541.60 km) |
| Alpena to Calw | 4,079.57 mi (6,565.43 km) |
| Alpena to Castrop-Rauxel | 3,919.19 mi (6,307.33 km) |
| Alpena to Celle | 3,977.49 mi (6,401.15 km) |
| Alpena to Cham | 4,204.03 mi (6,765.74 km) |
| Alpena to Chemnitz | 4,147.64 mi (6,674.99 km) |
| Alpena to Clausthal-Zellerfeld | 4,017.83 mi (6,466.08 km) |
| Alpena to Cloppenburg | 3,897.58 mi (6,272.54 km) |
| Alpena to Coburg | 4,100.65 mi (6,599.35 km) |
| Alpena to Coesfeld | 3,899.03 mi (6,274.88 km) |
| Alpena to Cologne | 3,928.64 mi (6,322.54 km) |
| Alpena to Coswig | 4,158.92 mi (6,693.13 km) |
