Ilocos Sur sits on the northwestern Luzon coast, sandwiched between the Cordillera foothills and the South China Sea. It contains Vigan City, a Spanish colonial town whose cobblestone streets and baroque architecture survive with rare completeness.
Vigan is the jewel and the burden of Ilocos Sur — a UNESCO World Heritage Site that defines the province's international identity while also generating the preservation pressures and tourism management challenges that come with that designation. Founded by the Spanish in 1572, when Juan de Salcedo arrived on 13 June, the provincial capital is one of the oldest colonial cities in the Philippines, and in 2015 it was named one of the New7Wonders Cities.
Vigan was inscribed as a UNESCO World Heritage Site in 1999. It is described as the best-preserved example of a planned Spanish colonial town in Asia. Its historic core — the Mestizo District or Calle Crisologo — contains over 200 houses from the eighteenth and nineteenth centuries, still occupied and maintained by their owners.
Outside Vigan, Ilocos Sur is an agricultural province of weaving towns, tobacco fields, and colonial churches. The province produced several major figures in Philippine history, including Padre Jose Burgos, one of the three martyred priests of 1872 whose execution helped catalyze the Philippine nationalist movement.
The 2024 census counted 709,991 people in Ilocos Sur's 32 municipalities and two component cities, Vigan, the capital, with 54,498 people, and Candon, the largest city. The province was created on 2 February 1818, when Ilocos was split into north and south. It covers 2,596 square kilometers between the South China Sea and the Cordillera, rising to Mount Camingingel at 2,371 meters, and the inland towns border Abra, Mountain Province and Benguet. Ilocano is the main language, with Kankana-ey spoken in the uplands.







