The Area Codes of United Kingdom:
| City/Town or Region | Area code | |
|---|---|---|
| 1. | Dalmally | 01838 (+441838) |
| 2. | Darlington | 01325 (+441325) |
| 3. | Dartford | 01322 (+441322) |
| 4. | Daventry | 01327 (+441327) |
| 5. | Derby | 01332 (+441332) |
| 6. | Dereham | 01362 (+441362) |
| 7. | Devizes | 01380 (+441380) |
| 8. | Dingwall | 01349 (+441349) |
| 9. | Diss | 01379 (+441379) |
| 10. | Doncaster | 01302 (+441302) |
| 11. | Dorchester | 01305 (+441305) |
| 12. | Dorking | 01306 (+441306) |
| 13. | Dover | 01304 (+441304) |
| 14. | Downham Market | 01366 (+441366) |
| 15. | Downpatrick (Northern Ireland) | 02844 (+442844) |
| 16. | Driffield | 01377 (+441377) |
| 17. | Dudley | 01384 (+441384) |
| 18. | Dulverton | 01398 (+441398) |
| 19. | Dumbarton | 01389 (+441389) |
| 20. | Dumfries | 01387 (+441387) |
| 21. | Dunbar | 01368 (+441368) |
| 22. | Dundee | 01382 (+441382) |
| 23. | Dunfermline | 01383 (+441383) |
| 24. | Dungannon (Northern Ireland) | 02887 (+442887) |
| 25. | Dunkeld | 01350 (+441350) |
| 26. | Dunoon | 01369 (+441369) |
| 27. | Duns | 01361 (+441361) |
| 28. | Dursley | 01453 (+441453) |