| Merthyr Tudful to Grand Prairie (Texas) | 4,628.27 mi (7,448.48 km) |
| Merthyr Tudful to Grand Rapids (Michigan) | 3,690.52 mi (5,939.32 km) |
| Merthyr Tudful to Grand Rapids (Minnesota) | 3,791.44 mi (6,101.73 km) |
| Merthyr Tudful to Grand Terrace (California) | 5,294.48 mi (8,520.65 km) |
| Merthyr Tudful to Grandview (Missouri) | 4,221.69 mi (6,794.16 km) |
| Merthyr Tudful to Grandview (Washington) | 4,692.84 mi (7,552.40 km) |
| Merthyr Tudful to Grandville (Michigan) | 3,697.13 mi (5,949.96 km) |
| Merthyr Tudful to Granger (Indiana) | 3,764.12 mi (6,057.77 km) |
| Merthyr Tudful to Granite Bay (California) | 5,150.59 mi (8,289.08 km) |
| Merthyr Tudful to Granite City (Illinois) | 4,059.67 mi (6,533.42 km) |
| Merthyr Tudful to Grants Pass (Oregon) | 5,005.36 mi (8,055.35 km) |
| Merthyr Tudful to Grantsville (Utah) | 4,771.67 mi (7,679.26 km) |
| Merthyr Tudful to Grapevine (Texas) | 4,617.70 mi (7,431.47 km) |
| Merthyr Tudful to Grass Valley (California) | 5,120.61 mi (8,240.82 km) |
| Merthyr Tudful to Grayslake (Illinois) | 3,810.08 mi (6,131.74 km) |
