| Round Rock to Castrovillari | 5,990.34 mi (9,640.51 km) |
| Round Rock to Catania | 6,040.61 mi (9,721.43 km) |
| Round Rock to Catanzaro | 6,046.20 mi (9,730.41 km) |
| Round Rock to Cattolica | 5,676.12 mi (9,134.84 km) |
| Round Rock to Cava de' Tirreni | 5,890.44 mi (9,479.74 km) |
| Round Rock to Cavallino | 6,051.58 mi (9,739.07 km) |
| Round Rock to Cavarzere | 5,603.35 mi (9,017.72 km) |
| Round Rock to Cave | 5,770.80 mi (9,287.21 km) |
| Round Rock to Cavriago | 5,557.88 mi (8,944.55 km) |
| Round Rock to Cavriglia | 5,642.89 mi (9,081.35 km) |
| Round Rock to Cazzago San Martino | 5,503.51 mi (8,857.04 km) |
| Round Rock to Ceccano | 5,797.65 mi (9,330.42 km) |
| Round Rock to Cecina | 5,610.66 mi (9,029.48 km) |
| Round Rock to Cefalu | 5,971.61 mi (9,610.37 km) |
| Round Rock to Ceglie Messapico | 6,008.49 mi (9,669.72 km) |
