| Altena to Cologno al Serio | 405.79 mi (653.05 km) |
| Altena to Cologno Monzese | 405.53 mi (652.64 km) |
| Altena to Colorno | 457.31 mi (735.97 km) |
| Altena to Comacchio | 501.31 mi (806.78 km) |
| Altena to Comiso | 1,048.26 mi (1,687.02 km) |
| Altena to Como | 384.80 mi (619.27 km) |
| Altena to Concordia Sagittaria | 449.63 mi (723.62 km) |
| Altena to Concorezzo | 401.86 mi (646.74 km) |
| Altena to Conegliano | 429.53 mi (691.26 km) |
| Altena to Conselice | 506.64 mi (815.36 km) |
| Altena to Conselve | 461.35 mi (742.47 km) |
| Altena to Conversano | 843.72 mi (1,357.84 km) |
| Altena to Copertino | 909.87 mi (1,464.30 km) |
| Altena to Copparo | 481.99 mi (775.68 km) |
| Altena to Corato | 814.84 mi (1,311.36 km) |
