| Boulder City to Carmona | 5,647.94 mi (9,089.48 km) |
| Boulder City to Cartagena | 5,835.38 mi (9,391.13 km) |
| Boulder City to Cartama | 5,723.79 mi (9,211.55 km) |
| Boulder City to Cartaya | 5,591.16 mi (8,998.11 km) |
| Boulder City to Caspe | 5,704.95 mi (9,181.22 km) |
| Boulder City to Cassa de la Selva | 5,784.02 mi (9,308.49 km) |
| Boulder City to Castalla | 5,801.93 mi (9,337.30 km) |
| Boulder City to Castellbisbal | 5,770.33 mi (9,286.44 km) |
| Boulder City to Castelldefels | 5,779.44 mi (9,301.12 km) |
| Boulder City to Castello de Ampurias | 5,773.77 mi (9,291.99 km) |
| Boulder City to Castellon de la Plana | 5,762.97 mi (9,274.60 km) |
| Boulder City to Castilleja de la Cuesta | 5,633.88 mi (9,066.86 km) |
| Boulder City to Catarroja | 5,775.25 mi (9,294.37 km) |
| Boulder City to Catral | 5,816.73 mi (9,361.12 km) |
| Boulder City to Caudete | 5,784.21 mi (9,308.79 km) |
