| Portsmouth to Cassina de' Pecchi | 603.77 mi (971.67 km) |
| Portsmouth to Cassino | 957.67 mi (1,541.23 km) |
| Portsmouth to Castagneto Carducci | 761.23 mi (1,225.08 km) |
| Portsmouth to Castano Primo | 580.53 mi (934.27 km) |
| Portsmouth to Castel Bolognese | 747.96 mi (1,203.73 km) |
| Portsmouth to Castel Gandolfo | 904.07 mi (1,454.96 km) |
| Portsmouth to Castel Goffredo | 654.53 mi (1,053.37 km) |
| Portsmouth to Castel Maggiore | 720.50 mi (1,159.54 km) |
| Portsmouth to Castel Mella | 633.49 mi (1,019.50 km) |
| Portsmouth to Castel San Giorgio | 1,024.65 mi (1,649.01 km) |
| Portsmouth to Castel San Giovanni | 627.76 mi (1,010.29 km) |
| Portsmouth to Castel San Pietro Terme | 736.13 mi (1,184.68 km) |
| Portsmouth to Castel Volturno | 983.60 mi (1,582.96 km) |
| Portsmouth to Castelbuono | 1,158.84 mi (1,864.97 km) |
| Portsmouth to Casteldaccia | 1,134.65 mi (1,826.04 km) |
