| South Portland to Chojnice | 3,806.52 mi (6,126.00 km) |
| South Portland to Chojnow | 3,826.59 mi (6,158.30 km) |
| South Portland to Chorzow | 3,974.13 mi (6,395.74 km) |
| South Portland to Choszczno | 3,745.82 mi (6,028.31 km) |
| South Portland to Chrzanow | 3,997.11 mi (6,432.73 km) |
| South Portland to Ciechanow | 3,945.75 mi (6,350.08 km) |
| South Portland to Ciechocinek | 3,878.31 mi (6,241.54 km) |
| South Portland to Cieszyn | 3,981.63 mi (6,407.81 km) |
| South Portland to Czarna Bialostocka | 4,024.38 mi (6,476.62 km) |
| South Portland to Czarnkow | 3,796.70 mi (6,110.20 km) |
| South Portland to Czechowice-Dziedzice | 3,990.05 mi (6,421.36 km) |
| South Portland to Czeladz | 3,977.99 mi (6,401.95 km) |
| South Portland to Czersk Pomorski | 3,818.75 mi (6,145.69 km) |
| South Portland to Czestochowa | 3,962.71 mi (6,377.36 km) |
| South Portland to Czluchow | 3,800.99 mi (6,117.10 km) |
