| Boulder to Cabestany | 5,176.36 mi (8,330.55 km) |
| Boulder to Cabries | 5,233.24 mi (8,422.08 km) |
| Boulder to Cachan | 4,881.08 mi (7,855.34 km) |
| Boulder to Caen | 4,768.46 mi (7,674.09 km) |
| Boulder to Cagnes-sur-Mer | 5,287.76 mi (8,509.83 km) |
| Boulder to Cahors | 5,039.89 mi (8,110.92 km) |
| Boulder to Calais | 4,771.12 mi (7,678.37 km) |
| Boulder to Caluire-et-Cuire | 5,105.06 mi (8,215.80 km) |
| Boulder to Cambrai | 4,851.70 mi (7,808.05 km) |
| Boulder to Canet-en-Roussillon | 5,177.69 mi (8,332.69 km) |
| Boulder to Cannes | 5,288.15 mi (8,510.46 km) |
| Boulder to Canteleu | 4,806.88 mi (7,735.93 km) |
| Boulder to Capbreton | 4,964.49 mi (7,989.58 km) |
| Boulder to Carcassonne | 5,129.75 mi (8,255.54 km) |
| Boulder to Carmaux | 5,084.78 mi (8,183.16 km) |
