| Merthyr Tudful to Delhi (California) | 5,213.97 mi (8,391.08 km) |
| Merthyr Tudful to Delray Beach (Florida) | 4,248.91 mi (6,837.96 km) |
| Merthyr Tudful to Deltona (Florida) | 4,174.01 mi (6,717.42 km) |
| Merthyr Tudful to Deming (New Mexico) | 5,057.01 mi (8,138.47 km) |
| Merthyr Tudful to Denison (Texas) | 4,556.01 mi (7,332.18 km) |
| Merthyr Tudful to Dent (Ohio) | 3,822.48 mi (6,151.69 km) |
| Merthyr Tudful to Denton (Texas) | 4,605.85 mi (7,412.40 km) |
| Merthyr Tudful to Dentsville (South Carolina) | 3,911.57 mi (6,295.06 km) |
| Merthyr Tudful to Denver (Colorado) | 4,557.44 mi (7,334.49 km) |
| Merthyr Tudful to Depew (New York) | 3,419.72 mi (5,503.50 km) |
| Merthyr Tudful to Derby (Connecticut) | 3,259.20 mi (5,245.17 km) |
| Merthyr Tudful to Derby (Kansas) | 4,390.71 mi (7,066.17 km) |
| Merthyr Tudful to Des Moines (Iowa) | 4,057.34 mi (6,529.67 km) |
| Merthyr Tudful to Des Moines (Washington) | 4,696.20 mi (7,557.80 km) |
| Merthyr Tudful to Des Plaines (Illinois) | 3,818.94 mi (6,146.00 km) |
