| Portsmouth to Cervignano del Friuli | 745.03 mi (1,199.02 km) |
| Portsmouth to Cesa | 998.90 mi (1,607.58 km) |
| Portsmouth to Cesano Maderno | 590.53 mi (950.37 km) |
| Portsmouth to Cesena | 772.60 mi (1,243.38 km) |
| Portsmouth to Cesenatico | 775.43 mi (1,247.94 km) |
| Portsmouth to Cetraro | 1,134.80 mi (1,826.28 km) |
| Portsmouth to Cherasco | 594.23 mi (956.32 km) |
| Portsmouth to Chiampo | 674.48 mi (1,085.47 km) |
| Portsmouth to Chiaravalle | 837.91 mi (1,348.48 km) |
| Portsmouth to Chiari | 622.68 mi (1,002.10 km) |
| Portsmouth to Chiavari | 659.97 mi (1,062.11 km) |
| Portsmouth to Chieri | 574.06 mi (923.86 km) |
| Portsmouth to Chieti | 927.56 mi (1,492.77 km) |
| Portsmouth to Chioggia | 726.82 mi (1,169.70 km) |
| Portsmouth to Chiusi | 815.37 mi (1,312.22 km) |
