| Portes-les-Valence to Cologno al Serio | 239.75 mi (385.85 km) |
| Portes-les-Valence to Cologno Monzese | 219.01 mi (352.45 km) |
| Portes-les-Valence to Colorno | 269.48 mi (433.69 km) |
| Portes-les-Valence to Comacchio | 358.39 mi (576.78 km) |
| Portes-les-Valence to Comiso | 745.57 mi (1,199.88 km) |
| Portes-les-Valence to Como | 214.41 mi (345.07 km) |
| Portes-les-Valence to Concordia Sagittaria | 392.09 mi (631.02 km) |
| Portes-les-Valence to Concorezzo | 222.53 mi (358.13 km) |
| Portes-les-Valence to Conegliano | 366.75 mi (590.23 km) |
| Portes-les-Valence to Conselice | 342.47 mi (551.16 km) |
| Portes-les-Valence to Conselve | 342.00 mi (550.40 km) |
| Portes-les-Valence to Conversano | 674.69 mi (1,085.81 km) |
| Portes-les-Valence to Copertino | 740.86 mi (1,192.30 km) |
| Portes-les-Valence to Copparo | 340.46 mi (547.92 km) |
| Portes-les-Valence to Corato | 635.74 mi (1,023.13 km) |
