| Boulder to Carpentras | 5,192.49 mi (8,356.50 km) |
| Boulder to Carquefou | 4,806.71 mi (7,735.65 km) |
| Boulder to Carqueiranne | 5,275.13 mi (8,489.49 km) |
| Boulder to Carrieres-sous-Poissy | 4,863.94 mi (7,827.76 km) |
| Boulder to Carrieres-sur-Seine | 4,874.37 mi (7,844.54 km) |
| Boulder to Carros | 5,284.25 mi (8,504.18 km) |
| Boulder to Carvin | 4,828.37 mi (7,770.52 km) |
| Boulder to Castanet-Tolosan | 5,083.48 mi (8,181.07 km) |
| Boulder to Castelginest | 5,073.06 mi (8,164.30 km) |
| Boulder to Castelnau-le-Lez | 5,169.10 mi (8,318.86 km) |
| Boulder to Castelnaudary | 5,109.75 mi (8,223.36 km) |
| Boulder to Castelsarrasin | 5,045.25 mi (8,119.54 km) |
| Boulder to Castres | 5,108.40 mi (8,221.18 km) |
| Boulder to Caudebec-les-Elbeuf | 4,813.65 mi (7,746.83 km) |
| Boulder to Caudry | 4,859.99 mi (7,821.39 km) |
