The Area Codes of United Kingdom:
| City/Town or Region | Area code | |
|---|---|---|
| 1. | Keighley | 01535 (+441535) |
| 2. | Keith | 01542 (+441542) |
| 3. | Kelso | 01573 (+441573) |
| 4. | Kendal | 01539 (+441539) |
| 5. | Kesh (Northern Ireland) | 02868 (+442868) |
| 6. | Keswick | 017687 (+4417687) |
| 7. | Kettering | 01536 (+441536) |
| 8. | Kidderminster | 01562 (+441562) |
| 9. | Kilchrenan | 01866 (+441866) |
| 10. | Killearn | 01360 (+441360) |
| 11. | Killin | 01567 (+441567) |
| 12. | Killingholme | 01469 (+441469) |
| 13. | Kilmarnock | 01563 (+441563) |
| 14. | Kilmelford | 01852 (+441852) |
| 15. | Kilrea (Northern Ireland) | 02829 (+442829) |
| 16. | King's Lynn | 01553 (+441553) |
| 17. | Kingsbridge | 01548 (+441548) |
| 18. | Kington | 01544 (+441544) |
| 19. | Kingussie | 01540 (+441540) |
| 20. | Kinloch Rannoch | 01882 (+441882) |
| 21. | Kinross | 01577 (+441577) |
| 22. | Kinrossie | 01821 (+441821) |
| 23. | Kircubbin (Northern Ireland) | 02842 (+442842) |
| 24. | Kirkcaldy | 01592 (+441592) |
| 25. | Kirkcudbright | 01557 (+441557) |
| 26. | Kirkwhelpington | 01830 (+441830) |
| 27. | Kirriemuir | 01575 (+441575) |
| 28. | Knighton | 01547 (+441547) |
| 29. | Knutsford | 01565 (+441565) |
| 30. | Kyle | 01599 (+441599) |