| Boston to Carmona | 1,104.86 mi (1,778.10 km) |
| Boston to Cartagena | 1,063.24 mi (1,711.12 km) |
| Boston to Cartama | 1,145.50 mi (1,843.50 km) |
| Boston to Cartaya | 1,137.08 mi (1,829.95 km) |
| Boston to Caspe | 811.20 mi (1,305.51 km) |
| Boston to Cassa de la Selva | 777.58 mi (1,251.39 km) |
| Boston to Castalla | 993.86 mi (1,599.46 km) |
| Boston to Castellbisbal | 799.85 mi (1,287.23 km) |
| Boston to Castelldefels | 813.33 mi (1,308.93 km) |
| Boston to Castello de Ampurias | 754.11 mi (1,213.63 km) |
| Boston to Castellon de la Plana | 897.58 mi (1,444.52 km) |
| Boston to Castilleja de la Cuesta | 1,115.53 mi (1,795.27 km) |
| Boston to Catarroja | 937.85 mi (1,509.33 km) |
| Boston to Catral | 1,024.27 mi (1,648.41 km) |
| Boston to Caudete | 987.01 mi (1,588.44 km) |
