| Merthyr Tudful to Grottaferrata | 1,020.62 mi (1,642.53 km) |
| Merthyr Tudful to Grottaglie | 1,254.38 mi (2,018.72 km) |
| Merthyr Tudful to Grottammare | 1,004.27 mi (1,616.21 km) |
| Merthyr Tudful to Grugliasco | 680.75 mi (1,095.56 km) |
| Merthyr Tudful to Grumo Appula | 1,203.62 mi (1,937.04 km) |
| Merthyr Tudful to Grumo Nevano | 1,119.95 mi (1,802.39 km) |
| Merthyr Tudful to Gualdo Tadino | 953.01 mi (1,533.72 km) |
| Merthyr Tudful to Guardiagrele | 1,054.94 mi (1,697.77 km) |
| Merthyr Tudful to Guastalla | 796.97 mi (1,282.60 km) |
| Merthyr Tudful to Gubbio | 939.56 mi (1,512.08 km) |
| Merthyr Tudful to Guspini | 1,021.01 mi (1,643.15 km) |
| Merthyr Tudful to Gussago | 747.24 mi (1,202.56 km) |
| Merthyr Tudful to Iesi | 956.09 mi (1,538.67 km) |
| Merthyr Tudful to Iesolo | 845.44 mi (1,360.60 km) |
| Merthyr Tudful to Iglesias | 1,031.29 mi (1,659.70 km) |
