| Portsmouth to Grottaferrata | 902.61 mi (1,452.61 km) |
| Portsmouth to Grottaglie | 1,136.18 mi (1,828.51 km) |
| Portsmouth to Grottammare | 886.05 mi (1,425.96 km) |
| Portsmouth to Grugliasco | 563.24 mi (906.44 km) |
| Portsmouth to Grumo Appula | 1,085.42 mi (1,746.81 km) |
| Portsmouth to Grumo Nevano | 1,001.78 mi (1,612.22 km) |
| Portsmouth to Gualdo Tadino | 834.71 mi (1,343.34 km) |
| Portsmouth to Guardiagrele | 936.65 mi (1,507.39 km) |
| Portsmouth to Guastalla | 678.72 mi (1,092.29 km) |
| Portsmouth to Gubbio | 821.26 mi (1,321.69 km) |
| Portsmouth to Guspini | 909.74 mi (1,464.08 km) |
| Portsmouth to Gussago | 629.13 mi (1,012.48 km) |
| Portsmouth to Iesi | 837.90 mi (1,348.47 km) |
| Portsmouth to Iesolo | 728.51 mi (1,172.42 km) |
| Portsmouth to Iglesias | 920.53 mi (1,481.44 km) |
