Region I – Ilocos Region Administrative Guide (Provinces, Cities, Municipalities & LGUs)

Region I, also known as the Ilocos Region, is composed of Ilocos Norte, Ilocos Sur, La Union, and Pangasinan. This administrative guide covers its provinces, cities, municipalities, population, geography, and LGU structure.

Region I – Ilocos Region Administrative Guide

Region I, officially known as the Ilocos Region, is located along the northwestern coast of Luzon. It is composed of four provinces—Ilocos Norte, Ilocos Sur, La Union, and Pangasinan—and is known for its rich cultural heritage, coastal landscapes, and well‑preserved historic sites.

This page serves as the official administrative hub for all LGUs within Region I.

by inslands.ph

Region Overview

  • Island Group: Luzon
  • Regional Center: City of San Fernando, La Union
  • Provinces: 4
  • Cities: 9
  • Municipalities: 116
  • Barangays: 3,267+
  • PSGC Code: 01000000

Region I is known for its heritage towns, wind farms, surf beaches, coastal plains, and mountain foothills.

Provinces of Region I

Ilocos Norte

  • Capital: Laoag City
  • Ilocos Norte Administrative Page
  • Cities & Municipalities of Ilocos Norte

Ilocos Sur

  • Capital: Vigan City
  • Ilocos Sur Administrative Page
  • Cities & Municipalities of Ilocos Sur

La Union

  • Capital: City of San Fernando
  • La Union Administrative Page
  • Cities & Municipalities of La Union

Pangasinan

  • Capital: Lingayen
  • Pangasinan Administrative Page
  • Cities & Municipalities of Pangasinan

Cities of Region I

Component & Independent Cities

  • Laoag City – Capital of Ilocos Norte
  • Vigan City – UNESCO Heritage City
  • San Fernando City (La Union) – Regional Center
  • Dagupan City – Independent Component City
  • Alaminos City – Home of Hundred Islands
  • Urdaneta City
  • San Carlos City
  • Batac City
  • Candon City

Municipalities of Region I

Region I contains 116 municipalities, organized by province. Each province’s LGU index page provides full listings:

  • Ilocos Norte LGUs
  • Ilocos Sur LGUs
  • La Union LGUs
  • Pangasinan LGUs

Geography & Environment

Landscape

Region I features:

  • Long coastal plains
  • Foothills of the Cordillera
  • River basins (Agno, Padsan, Abra)
  • Volcanic and limestone formations

Climate

  • Tropical monsoon
  • Dry season: November–April
  • Wet season: May–October

Cultural & Historical Profile

Region I is known for:

  • Ilocano cultural heritage
  • Spanish-era architecture
  • UNESCO-listed Vigan
  • Traditional weaving (inabel)
  • Coastal fishing communities
  • Wind farms (Bangui, Burgos)

Economic Profile

Key Sectors

  • Agriculture (rice, corn, tobacco)
  • Fisheries
  • Tourism
  • Renewable energy (wind, solar)
  • Trade & services

Major Infrastructure

  • Laoag International Airport
  • San Fernando Seaport
  • Ilocos Norte Wind Farm Complex
  • National highways connecting Luzon’s northwest corridor

Internal Links

Conclusion

Region I is one of the most historically rich and geographically diverse regions of Luzon. This administrative page provides a complete overview of its provinces, cities, municipalities, and LGU structure, forming a key part of your national administrative silo.