| Porsgrunn to Cortona | 1,098.71 mi (1,768.21 km) |
| Porsgrunn to Cosenza | 1,399.00 mi (2,251.47 km) |
| Porsgrunn to Cossato | 938.34 mi (1,510.11 km) |
| Porsgrunn to Costa Volpino | 918.05 mi (1,477.45 km) |
| Porsgrunn to Creazzo | 941.34 mi (1,514.95 km) |
| Porsgrunn to Crema | 949.96 mi (1,528.81 km) |
| Porsgrunn to Cremona | 966.18 mi (1,554.91 km) |
| Porsgrunn to Crevalcore | 996.70 mi (1,604.03 km) |
| Porsgrunn to Crispiano | 1,320.49 mi (2,125.12 km) |
| Porsgrunn to Crosia | 1,385.72 mi (2,230.11 km) |
| Porsgrunn to Crotone | 1,422.02 mi (2,288.52 km) |
| Porsgrunn to Cuneo | 1,021.95 mi (1,644.67 km) |
| Porsgrunn to Cuorgne | 952.25 mi (1,532.49 km) |
| Porsgrunn to Cusano Milanino | 937.55 mi (1,508.84 km) |
| Porsgrunn to Cutro | 1,424.11 mi (2,291.88 km) |
