La Union is also known as the Pilgrimage Center of North Luzon because of its ancient churches and pilgrimage sites. It is located in the Ilocos region and its capital city is San Fernando. It has a total area of 1,497.70 square kilometers and has a total of 19 municipalities, 1 component city, and 576 barangays. Places to visit in La Union are Tangadan Falls, Tapuakan River, and Pagoda Hill.
| Location | ZIP Code/Postal Code | Phone Area Code |
| Agoo | 2504 | 72 |
| Aringay | 2503 | 72 |
| Bacnotan | 2515 | 72 |
| Bagulin | 2512 | 72 |
| Balaoan | 2517 | 72 |
| Bangar | 2519 | 72 |
| Bauang | 2501 | 72 |
| Burgos | 2510 | 72 |
| Caba | 2502 | 72 |
| Damortis | 2507 | 72 |
| Luna | 2518 | 72 |
| Naguillan | 2511 | 72 |
| Pugo | 2508 | 72 |
| Rosario | 2506 | 72 |
| San Fernando | 2500 | 72 |
| San Gabriel | 2513 | 72 |
| San Juan | 2514 | 72 |
| Santol | 2516 | 72 |
| Santo Tomas | 2505 | 72 |
| Sudepen | 2520 | 72 |
| Tubao | 2509 | 72 |
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