| Porsgrunn to Collegno | 974.05 mi (1,567.58 km) |
| Porsgrunn to Cologno al Serio | 934.99 mi (1,504.72 km) |
| Porsgrunn to Cologno Monzese | 938.94 mi (1,511.08 km) |
| Porsgrunn to Colorno | 980.31 mi (1,577.65 km) |
| Porsgrunn to Comacchio | 1,001.41 mi (1,611.62 km) |
| Porsgrunn to Comiso | 1,547.09 mi (2,489.79 km) |
| Porsgrunn to Como | 919.67 mi (1,480.07 km) |
| Porsgrunn to Concordia Sagittaria | 931.49 mi (1,499.09 km) |
| Porsgrunn to Concorezzo | 934.68 mi (1,504.22 km) |
| Porsgrunn to Conegliano | 920.30 mi (1,481.08 km) |
| Porsgrunn to Conselice | 1,012.63 mi (1,629.66 km) |
| Porsgrunn to Conselve | 963.39 mi (1,550.43 km) |
| Porsgrunn to Conversano | 1,294.44 mi (2,083.20 km) |
| Porsgrunn to Copertino | 1,352.17 mi (2,176.11 km) |
| Porsgrunn to Copparo | 986.22 mi (1,587.17 km) |
