| Alpena to Cadiz | 3,923.58 mi (6,314.39 km) |
| Alpena to Calafell | 4,087.80 mi (6,578.67 km) |
| Alpena to Calahorra | 3,894.21 mi (6,267.13 km) |
| Alpena to Calasparra | 4,063.57 mi (6,539.68 km) |
| Alpena to Calatayud | 3,944.60 mi (6,348.23 km) |
| Alpena to Caldas de Montbuy | 4,096.05 mi (6,591.96 km) |
| Alpena to Caldas de Reyes | 3,593.48 mi (5,783.14 km) |
| Alpena to Calella | 4,117.67 mi (6,626.75 km) |
| Alpena to Callosa de Segura | 4,104.22 mi (6,605.10 km) |
| Alpena to Calpe | 4,123.89 mi (6,636.76 km) |
| Alpena to Calvia | 4,193.57 mi (6,748.89 km) |
| Alpena to Camas | 3,901.74 mi (6,279.25 km) |
| Alpena to Cambados | 3,589.93 mi (5,777.43 km) |
| Alpena to Cambre | 3,583.37 mi (5,766.88 km) |
| Alpena to Cambrils | 4,071.18 mi (6,551.94 km) |
