| Merthyr Tudful to Darlaston | 80.38 mi (129.35 km) |
| Merthyr Tudful to Darlington | 206.68 mi (332.63 km) |
| Merthyr Tudful to Dartford | 155.84 mi (250.80 km) |
| Merthyr Tudful to Darton | 148.91 mi (239.65 km) |
| Merthyr Tudful to Darwen | 140.42 mi (225.98 km) |
| Merthyr Tudful to Daventry | 100.71 mi (162.08 km) |
| Merthyr Tudful to Davyhulme | 125.70 mi (202.30 km) |
| Merthyr Tudful to Dawlish | 80.38 mi (129.35 km) |
| Merthyr Tudful to Deal | 208.69 mi (335.86 km) |
| Merthyr Tudful to Denby Dale | 145.54 mi (234.22 km) |
| Merthyr Tudful to Denton | 129.69 mi (208.71 km) |
| Merthyr Tudful to Derby | 114.35 mi (184.02 km) |
| Merthyr Tudful to Derry | 277.55 mi (446.67 km) |
| Merthyr Tudful to Desborough | 118.88 mi (191.33 km) |
| Merthyr Tudful to Devizes | 65.22 mi (104.96 km) |
