| Merthyr Tudful to Germantown (Wisconsin) | 3,772.87 mi (6,071.84 km) |
| Merthyr Tudful to Gibsonton (Florida) | 4,276.73 mi (6,882.73 km) |
| Merthyr Tudful to Gig Harbor (Washington) | 4,707.02 mi (7,575.21 km) |
| Merthyr Tudful to Gilbert (Arizona) | 5,143.65 mi (8,277.90 km) |
| Merthyr Tudful to Gillette (Wyoming) | 4,347.96 mi (6,997.37 km) |
| Merthyr Tudful to Gilroy (California) | 5,263.42 mi (8,470.66 km) |
| Merthyr Tudful to Gladeview (Florida) | 4,286.13 mi (6,897.86 km) |
| Merthyr Tudful to Gladstone (Missouri) | 4,206.82 mi (6,770.22 km) |
| Merthyr Tudful to Gladstone (Oregon) | 4,816.70 mi (7,751.73 km) |
| Merthyr Tudful to Glasgow (Delaware) | 3,442.98 mi (5,540.93 km) |
| Merthyr Tudful to Glasgow (Kentucky) | 3,975.44 mi (6,397.85 km) |
| Merthyr Tudful to Glassboro (New Jersey) | 3,412.43 mi (5,491.78 km) |
| Merthyr Tudful to Glassmanor (Maryland) | 3,528.46 mi (5,678.51 km) |
| Merthyr Tudful to Glen Allen (Virginia) | 3,600.90 mi (5,795.08 km) |
| Merthyr Tudful to Glen Burnie (Maryland) | 3,497.97 mi (5,629.44 km) |
