San Fernando, officially the City of San Fernando, is a component city and the capital of the province of La Union, Philippines. It serves as the regional and administrative center of the Ilocos Region. The city also functions as a hub for trade and commerce in northern Luzon and as a center for the culture and heritage of Ilocandia. According to the 2020 census, it has a population of 125,642 with 76,555 registered voters as of 2022.