| Mariehamn to Chojnow | 629.61 mi (1,013.25 km) |
| Mariehamn to Chorzow | 678.20 mi (1,091.46 km) |
| Mariehamn to Choszczno | 508.57 mi (818.47 km) |
| Mariehamn to Chrzanow | 688.95 mi (1,108.76 km) |
| Mariehamn to Ciechanow | 500.48 mi (805.44 km) |
| Mariehamn to Ciechocinek | 500.53 mi (805.53 km) |
| Mariehamn to Cieszyn | 716.94 mi (1,153.80 km) |
| Mariehamn to Czarna Bialostocka | 486.56 mi (783.04 km) |
| Mariehamn to Czarnkow | 513.60 mi (826.56 km) |
| Mariehamn to Czechowice-Dziedzice | 704.79 mi (1,134.24 km) |
| Mariehamn to Czeladz | 675.63 mi (1,087.32 km) |
| Mariehamn to Czersk Pomorski | 441.95 mi (711.24 km) |
| Mariehamn to Czestochowa | 643.35 mi (1,035.37 km) |
| Mariehamn to Czluchow | 454.85 mi (732.00 km) |
| Mariehamn to Dabrowa Gornicza | 676.26 mi (1,088.34 km) |
