| Somain to Carpentras | 443.21 mi (713.28 km) |
| Somain to Carquefou | 302.96 mi (487.57 km) |
| Somain to Carqueiranne | 518.84 mi (834.99 km) |
| Somain to Carrieres-sous-Poissy | 112.12 mi (180.44 km) |
| Somain to Carrieres-sur-Seine | 109.36 mi (175.99 km) |
| Somain to Carros | 490.66 mi (789.64 km) |
| Somain to Carvin | 17.00 mi (27.36 km) |
| Somain to Castanet-Tolosan | 480.11 mi (772.66 km) |
| Somain to Castelginest | 468.54 mi (754.04 km) |
| Somain to Castelnau-le-Lez | 465.27 mi (748.77 km) |
| Somain to Castelnaudary | 490.38 mi (789.19 km) |
| Somain to Castelsarrasin | 448.21 mi (721.32 km) |
| Somain to Castres | 469.40 mi (755.43 km) |
| Somain to Caudebec-les-Elbeuf | 125.20 mi (201.49 km) |
| Somain to Caudry | 17.08 mi (27.49 km) |
