Vigan, officially known as the City of Vigan, is a 4th class component city and capital of the province of Ilocos Sur, Philippines.

According to the 2020 census, it has a population of 53, 935 people. Located on the western coast of the large island of Luzon, facing the South China Sea, it is a UNESCO World Heritage Site and it is one of the few Spanish colonial towns left in the Philippines whose old structures have mostly remained intact, and it is well known for its sett pavements and unique architecture of the Spanish Philippines colonial era which fuses Native Philippine and Oriental building designs and construction, with colonial Spanish architecture that is still abundant in the area.

Due to silting of the Mestizo River, Vigan City is no longer separated from the mainland, therefore any longer an island. The city is unique in the Philippines because it is one of many extensive surviving Philippine historic cities, dating back to the 16th century.

Vigan was a coastal trading post long before the Spaniards arrived; Chinese traders sailing from the West Philippine Sea came to Isla de Vigan (Island of Vigan) via the Mestizo River that surrounded it.

Vigan is made up of 39 barangays. Thirty of them are classified as rural, but they occupy only 2,366 hectares. The remaining nine are classified as Poblacion barangays and are together 144.75 hectares big.

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