| Harpenden to Grottaferrata | 924.37 mi (1,487.63 km) |
| Harpenden to Grottaglie | 1,148.46 mi (1,848.26 km) |
| Harpenden to Grottammare | 899.40 mi (1,447.44 km) |
| Harpenden to Grugliasco | 590.53 mi (950.37 km) |
| Harpenden to Grumo Appula | 1,098.03 mi (1,767.11 km) |
| Harpenden to Grumo Nevano | 1,021.53 mi (1,643.99 km) |
| Harpenden to Gualdo Tadino | 850.45 mi (1,368.67 km) |
| Harpenden to Guardiagrele | 952.07 mi (1,532.20 km) |
| Harpenden to Guastalla | 693.72 mi (1,116.44 km) |
| Harpenden to Gubbio | 837.21 mi (1,347.35 km) |
| Harpenden to Guspini | 951.51 mi (1,531.31 km) |
| Harpenden to Gussago | 642.16 mi (1,033.46 km) |
| Harpenden to Iesi | 850.90 mi (1,369.40 km) |
| Harpenden to Iesolo | 733.21 mi (1,179.99 km) |
| Harpenden to Iglesias | 963.08 mi (1,549.93 km) |
