| Boulder to Castrovillari | 5,802.35 mi (9,337.97 km) |
| Boulder to Catania | 5,883.07 mi (9,467.89 km) |
| Boulder to Catanzaro | 5,864.20 mi (9,437.52 km) |
| Boulder to Cattolica | 5,470.30 mi (8,803.61 km) |
| Boulder to Cava de' Tirreni | 5,704.22 mi (9,180.06 km) |
| Boulder to Cavallino | 5,844.75 mi (9,406.22 km) |
| Boulder to Cavarzere | 5,389.73 mi (8,673.93 km) |
| Boulder to Cave | 5,585.33 mi (8,988.72 km) |
| Boulder to Cavriago | 5,358.18 mi (8,623.15 km) |
| Boulder to Cavriglia | 5,449.50 mi (8,770.12 km) |
| Boulder to Cazzago San Martino | 5,297.67 mi (8,525.78 km) |
| Boulder to Ceccano | 5,612.04 mi (9,031.70 km) |
| Boulder to Cecina | 5,425.39 mi (8,731.32 km) |
| Boulder to Cefalu | 5,816.50 mi (9,360.75 km) |
| Boulder to Ceglie Messapico | 5,803.43 mi (9,339.72 km) |
