| Portsmouth to Castrovillari | 1,127.19 mi (1,814.04 km) |
| Portsmouth to Catania | 1,214.57 mi (1,954.66 km) |
| Portsmouth to Catanzaro | 1,188.92 mi (1,913.38 km) |
| Portsmouth to Cattolica | 798.70 mi (1,285.39 km) |
| Portsmouth to Cava de' Tirreni | 1,028.92 mi (1,655.89 km) |
| Portsmouth to Cavallino | 1,175.39 mi (1,891.60 km) |
| Portsmouth to Cavarzere | 722.62 mi (1,162.94 km) |
| Portsmouth to Cave | 910.15 mi (1,464.75 km) |
| Portsmouth to Cavriago | 683.77 mi (1,100.43 km) |
| Portsmouth to Cavriglia | 774.29 mi (1,246.10 km) |
| Portsmouth to Cazzago San Martino | 625.26 mi (1,006.27 km) |
| Portsmouth to Ceccano | 936.81 mi (1,507.65 km) |
| Portsmouth to Cecina | 750.74 mi (1,208.19 km) |
| Portsmouth to Cefalu | 1,150.58 mi (1,851.67 km) |
| Portsmouth to Ceglie Messapico | 1,133.00 mi (1,823.39 km) |
