| Round Rock to Carmona | 5,075.31 mi (8,167.92 km) |
| Round Rock to Cartagena | 5,297.60 mi (8,525.67 km) |
| Round Rock to Cartama | 5,148.03 mi (8,284.96 km) |
| Round Rock to Cartaya | 5,005.80 mi (8,056.06 km) |
| Round Rock to Caspe | 5,223.09 mi (8,405.75 km) |
| Round Rock to Cassa de la Selva | 5,332.70 mi (8,582.15 km) |
| Round Rock to Castalla | 5,279.70 mi (8,496.85 km) |
| Round Rock to Castellbisbal | 5,306.67 mi (8,540.26 km) |
| Round Rock to Castelldefels | 5,313.07 mi (8,550.57 km) |
| Round Rock to Castello de Ampurias | 5,328.98 mi (8,576.17 km) |
| Round Rock to Castellon de la Plana | 5,264.08 mi (8,471.71 km) |
| Round Rock to Castilleja de la Cuesta | 5,057.29 mi (8,138.92 km) |
| Round Rock to Catarroja | 5,265.80 mi (8,474.48 km) |
| Round Rock to Catral | 5,287.68 mi (8,509.70 km) |
| Round Rock to Caudete | 5,261.09 mi (8,466.91 km) |
