| Merthyr Tudful to Dewsbury | 153.12 mi (246.42 km) |
| Merthyr Tudful to Deysbrook | 117.97 mi (189.86 km) |
| Merthyr Tudful to Didcot | 92.05 mi (148.14 km) |
| Merthyr Tudful to Dingle | 114.27 mi (183.91 km) |
| Merthyr Tudful to Dinnington | 144.75 mi (232.96 km) |
| Merthyr Tudful to Dodworth | 146.63 mi (235.98 km) |
| Merthyr Tudful to Dollis Hill | 135.32 mi (217.78 km) |
| Merthyr Tudful to Doncaster | 154.85 mi (249.20 km) |
| Merthyr Tudful to Dorchester | 81.85 mi (131.73 km) |
| Merthyr Tudful to Dorking | 135.76 mi (218.48 km) |
| Merthyr Tudful to Dorridge | 81.49 mi (131.14 km) |
| Merthyr Tudful to Dover | 206.24 mi (331.91 km) |
| Merthyr Tudful to Downham Market | 170.27 mi (274.02 km) |
| Merthyr Tudful to Droitwich | 63.45 mi (102.11 km) |
| Merthyr Tudful to Dronfield | 134.40 mi (216.30 km) |
