The Area Codes of Bulgaria:
| City/Town or Region | Area code | |
|---|---|---|
| 1. | Kardzhali | 036 (+35936) |
| 2. | Kavarna | 0570 (+359570) |
| 3. | Kazanlak | 0431 (+359431) |
| 4. | Koprivshtitsa | 0718 (+359718) |
| 5. | Kostinbrod | 0721 (+359721) |
| 6. | Kotel | 0453 (+359453) |
| 7. | Kozloduy | 0973 (+359973) |
| 8. | Kula | 0938 (+359938) |
| 9. | Kyustendil | 070 (+35970) |
| 10. | Kyustendil | 078 (+35978) |
| 11. | Kyustendil codes | 079 (+35979) |