| Portsmouth to Collegno | 562.58 mi (905.39 km) |
| Portsmouth to Cologno al Serio | 613.05 mi (986.61 km) |
| Portsmouth to Cologno Monzese | 600.00 mi (965.61 km) |
| Portsmouth to Colorno | 667.54 mi (1,074.30 km) |
| Portsmouth to Comacchio | 745.25 mi (1,199.36 km) |
| Portsmouth to Comiso | 1,230.37 mi (1,980.09 km) |
| Portsmouth to Como | 580.28 mi (933.87 km) |
| Portsmouth to Concordia Sagittaria | 727.61 mi (1,170.97 km) |
| Portsmouth to Concorezzo | 599.34 mi (964.55 km) |
| Portsmouth to Conegliano | 700.87 mi (1,127.94 km) |
| Portsmouth to Conselice | 740.15 mi (1,191.15 km) |
| Portsmouth to Conselve | 710.26 mi (1,143.05 km) |
| Portsmouth to Conversano | 1,103.37 mi (1,775.71 km) |
| Portsmouth to Copertino | 1,172.19 mi (1,886.45 km) |
| Portsmouth to Copparo | 723.22 mi (1,163.91 km) |
