| Merthyr Tudful to Glen Carbon (Illinois) | 4,052.68 mi (6,522.16 km) |
| Merthyr Tudful to Glen Cove (New York) | 3,300.94 mi (5,312.35 km) |
| Merthyr Tudful to Glen Ellyn (Illinois) | 3,832.87 mi (6,168.41 km) |
| Merthyr Tudful to Glen Rock (New Jersey) | 3,317.52 mi (5,339.03 km) |
| Merthyr Tudful to Glendale (Arizona) | 5,145.92 mi (8,281.56 km) |
| Merthyr Tudful to Glendale (California) | 5,316.93 mi (8,556.77 km) |
| Merthyr Tudful to Glendale (Wisconsin) | 3,770.25 mi (6,067.62 km) |
| Merthyr Tudful to Glendale Heights (Illinois) | 3,831.04 mi (6,165.46 km) |
| Merthyr Tudful to Glendora (California) | 5,305.80 mi (8,538.86 km) |
| Merthyr Tudful to Glenmont (Maryland) | 3,519.85 mi (5,664.65 km) |
| Merthyr Tudful to Glenn Dale (Maryland) | 3,513.73 mi (5,654.80 km) |
| Merthyr Tudful to Glenn Heights (Texas) | 4,628.77 mi (7,449.29 km) |
| Merthyr Tudful to Glenpool (Oklahoma) | 4,423.57 mi (7,119.04 km) |
| Merthyr Tudful to Glens Falls (New York) | 3,199.70 mi (5,149.42 km) |
| Merthyr Tudful to Glenvar Heights (Florida) | 4,296.07 mi (6,913.85 km) |
