is a first class city in the province of Ilocos Norte,
Philippines. It is the capital city of Ilocos Norte, and the province's
political, commercial, and industrial hub. It is the northernmost city in the
Philippines and the location of the Ilocos region's only commercial airport.
According to the 2010 census, it had a population of 104,904 people.
The municipalities of San Nicolas, Paoay, Sarrat, Vintar, and Bacarra form
its boundaries. The foothills of the Cordillera Central mountain range to the
east, and the South China Sea to the west are its physical boundaries.