| La Union | |
| Area | Zip |
| Agoo | 2504 |
| Aringay | 2503 |
| Bacnotan | 2515 |
| Bagulin | 2512 |
| Balaoan | 2517 |
| Bangar | 2519 |
| Bauang | 2501 |
| Burgos | 2510 |
| Caba | 2502 |
| Damortis | 2507 |
| Luna | 2518 |
| Naguillan | 2511 |
| Pugo | 2508 |
| Rosario | 2506 |
| San Fernando | 2500 |
| San Gabriel | 2513 |
| San Juan | 2514 |
| Santol | 2516 |
| Santo Tomas | 2505 |
| Sudepen | 2520 |
| Tubao | 2509 |
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