The Area Codes of United Kingdom:
| City/Town or Region | Area code | |
|---|---|---|
| 1. | Raughton Head | 016974 (+4416974) |
| 2. | Reading | 0118 (+44118) |
| 3. | Redditch | 01527 (+441527) |
| 4. | Redhill | 01737 (+441737) |
| 5. | Redruth | 01209 (+441209) |
| 6. | Retford | 01777 (+441777) |
| 7. | Rhyl | 01745 (+441745) |
| 8. | Richmond | 01748 (+441748) |
| 9. | Ringwood, New Milton and Highcliffe | 01425 (+441425) |
| 10. | Ripley | 01773 (+441773) |
| 11. | Ripon | 01765 (+441765) |
| 12. | Rochdale, Rossendale and Shaw | 01706 (+441706) |
| 13. | Rockbourne | 01725 (+441725) |
| 14. | Romford | 01708 (+441708) |
| 15. | Romsey | 01794 (+441794) |
| 16. | Ross-on-Wye | 01989 (+441989) |
| 17. | Rostrevor (Northern Ireland) | 02841 (+442841) |
| 18. | Rothbury | 01669 (+441669) |
| 19. | Rotherham | 01709 (+441709) |
| 20. | Rothesay | 01700 (+441700) |
| 21. | Royston | 01763 (+441763) |
| 22. | Rugby | 01788 (+441788) |
| 23. | Rugeley | 01889 (+441889) |
| 24. | Runcorn, Warrington | 01928 (+441928) |
| 25. | Ruthin | 01824 (+441824) |
| 26. | Rye | 01797 (+441797) |