| Alpena to Cocentaina | 4,098.60 mi (6,596.06 km) |
| Alpena to Coin | 3,988.85 mi (6,419.43 km) |
| Alpena to Colindres | 3,790.26 mi (6,099.83 km) |
| Alpena to Collado-Villalba | 3,868.41 mi (6,225.60 km) |
| Alpena to Colmenar Viejo | 3,878.08 mi (6,241.17 km) |
| Alpena to Colmenarejo | 3,870.77 mi (6,229.40 km) |
| Alpena to Conil de la Frontera | 3,943.93 mi (6,347.14 km) |
| Alpena to Consuegra | 3,930.83 mi (6,326.06 km) |
| Alpena to Corbera de Llobregat | 4,094.61 mi (6,589.64 km) |
| Alpena to Cordoba | 3,939.62 mi (6,340.20 km) |
| Alpena to Coria del Rio | 3,905.60 mi (6,285.45 km) |
| Alpena to Crevillente | 4,102.28 mi (6,601.98 km) |
| Alpena to Cuarte de Huerva | 3,966.52 mi (6,383.50 km) |
| Alpena to Cubellas | 4,091.86 mi (6,585.21 km) |
| Alpena to Cuellar | 3,826.27 mi (6,157.79 km) |
