| Round Rock to Cortona | 5,673.20 mi (9,130.14 km) |
| Round Rock to Cosenza | 6,014.38 mi (9,679.21 km) |
| Round Rock to Cossato | 5,428.55 mi (8,736.41 km) |
| Round Rock to Costa Volpino | 5,496.98 mi (8,846.54 km) |
| Round Rock to Creazzo | 5,563.88 mi (8,954.19 km) |
| Round Rock to Crema | 5,497.82 mi (8,847.89 km) |
| Round Rock to Cremona | 5,520.91 mi (8,885.05 km) |
| Round Rock to Crevalcore | 5,582.31 mi (8,983.86 km) |
| Round Rock to Crispiano | 5,999.71 mi (9,655.60 km) |
| Round Rock to Crosia | 6,024.71 mi (9,695.83 km) |
| Round Rock to Crotone | 6,060.11 mi (9,752.80 km) |
| Round Rock to Cuneo | 5,446.59 mi (8,765.44 km) |
| Round Rock to Cuorgne | 5,413.85 mi (8,712.75 km) |
| Round Rock to Cusano Milanino | 5,470.61 mi (8,804.09 km) |
| Round Rock to Cutro | 6,056.64 mi (9,747.22 km) |
