The Area Codes of Mongolia:
| City/Town or Region | Area code | |
|---|---|---|
| 1. | Ugtaal | 2765 (+976 2765) |
| 2. | Ulaan-Uul | 3855 (+976 3855) |
| 3. | Ulaanbaatar | 1 (+976 1) |
| 4. | Ulaanbadrakh | 5251 (+976 5251) |
| 5. | Ulaangom city | 452 (+976 452) |
| 6. | Ulaankhus | 4252 (+976 4252) |
| 7. | Uliastai city | 462 (+976 462) |
| 8. | Urgamal | 4658 (+976 4658) |
| 9. | Uulbayan | 5151 (+976 5151) |
| 10. | Uyanga | 3256 (+976 3256) |
| 11. | Üyench | 4353 (+976 4353) |