| Portsmouth to Chivasso | 567.29 mi (912.97 km) |
| Portsmouth to Ciampino | 899.55 mi (1,447.68 km) |
| Portsmouth to Cicciano | 1,009.42 mi (1,624.50 km) |
| Portsmouth to Cingoli | 844.34 mi (1,358.84 km) |
| Portsmouth to Cinisello Balsamo | 596.78 mi (960.43 km) |
| Portsmouth to Cinisi | 1,114.76 mi (1,794.03 km) |
| Portsmouth to Cirie | 555.48 mi (893.96 km) |
| Portsmouth to Ciro Marina | 1,183.22 mi (1,904.21 km) |
| Portsmouth to Cislago | 583.14 mi (938.47 km) |
| Portsmouth to Cisterna di Latina | 918.18 mi (1,477.67 km) |
| Portsmouth to Cisternino | 1,126.48 mi (1,812.89 km) |
| Portsmouth to Citta di Castello | 804.25 mi (1,294.32 km) |
| Portsmouth to Citta Sant'Angelo | 915.27 mi (1,472.99 km) |
| Portsmouth to Cittadella | 689.85 mi (1,110.20 km) |
| Portsmouth to Cittanova | 1,200.45 mi (1,931.94 km) |
