| Porsgrunn to Chivasso | 965.10 mi (1,553.18 km) |
| Porsgrunn to Ciampino | 1,202.85 mi (1,935.80 km) |
| Porsgrunn to Cicciano | 1,271.30 mi (2,045.95 km) |
| Porsgrunn to Cingoli | 1,098.29 mi (1,767.52 km) |
| Porsgrunn to Cinisello Balsamo | 937.52 mi (1,508.79 km) |
| Porsgrunn to Cinisi | 1,455.23 mi (2,341.96 km) |
| Porsgrunn to Cirie | 963.07 mi (1,549.91 km) |
| Porsgrunn to Ciro Marina | 1,402.73 mi (2,257.47 km) |
| Porsgrunn to Cislago | 930.90 mi (1,498.13 km) |
| Porsgrunn to Cisterna di Latina | 1,218.30 mi (1,960.66 km) |
| Porsgrunn to Cisternino | 1,313.67 mi (2,114.14 km) |
| Porsgrunn to Citta di Castello | 1,086.97 mi (1,749.31 km) |
| Porsgrunn to Citta Sant'Angelo | 1,161.81 mi (1,869.76 km) |
| Porsgrunn to Cittadella | 934.37 mi (1,503.72 km) |
| Porsgrunn to Cittanova | 1,462.29 mi (2,353.33 km) |
