| Alpena to Collegno | 4,179.75 mi (6,726.67 km) |
| Alpena to Cologno al Serio | 4,242.55 mi (6,827.73 km) |
| Alpena to Cologno Monzese | 4,228.40 mi (6,804.95 km) |
| Alpena to Colorno | 4,296.09 mi (6,913.89 km) |
| Alpena to Comacchio | 4,375.78 mi (7,042.13 km) |
| Alpena to Comiso | 4,816.94 mi (7,752.11 km) |
| Alpena to Como | 4,209.40 mi (6,774.37 km) |
| Alpena to Concordia Sagittaria | 4,355.83 mi (7,010.04 km) |
| Alpena to Concorezzo | 4,228.14 mi (6,804.53 km) |
| Alpena to Conegliano | 4,329.74 mi (6,968.04 km) |
| Alpena to Conselice | 4,370.04 mi (7,032.90 km) |
| Alpena to Conselve | 4,340.91 mi (6,986.02 km) |
| Alpena to Conversano | 4,732.91 mi (7,616.89 km) |
| Alpena to Copertino | 4,801.65 mi (7,727.52 km) |
| Alpena to Copparo | 4,353.75 mi (7,006.68 km) |
