La Union is a coastal province on the western edge of Luzon, facing the South China Sea. It is one of the Ilocos Region provinces, though its southern municipalities share cultural and linguistic ties with the Ilocano north and the Pangasinan lowlands to the south. Its coastline runs for about 90 kilometers, and it is best known today as the surf capital of northern Luzon — the break at San Juan drawing surfers from across the country year-round.
La Union's capital, San Fernando City, shares its name with San Fernando City in Pampanga — the capital of that province in Central Luzon. The two are unrelated and roughly 250 kilometers apart. The Ilocos San Fernando is the smaller of the two.
The province is mostly hilly interior terrain with a narrow coastal plain. The Cordillera foothills rise sharply behind the shoreline in the northern municipalities. Agriculture — rice, tobacco, vegetables — fills the lowland areas. The coast itself, with its long stretches of gray-brown sand and waves from the South China Sea, drew the surf community that now defines the province's tourism.
San Fernando City is the administrative and commercial center. It sits roughly midway along the province's coastline and serves as the main transport hub connecting the Ilocos region to Metro Manila and the Cordillera provinces.
The 2024 census counted 825,072 people in La Union, which has 19 municipalities, the city of San Fernando and 576 barangays. Twelve of its towns are on the coast, and small-scale fishing still makes up most of the province's fish catch.
