For the La Unión province of El Salvador, see La Unión Department, El Salvador.
Basic Ridge. Located 9 kilometers northeast of San Fernando town proper through the Imperial Army in the province. Later, the Ridge constituted the East Flank of the 121st Infantry of the United States Armed Forces in the Philippines, Northern Luzon (USAFIP NL) during the Liberation in 1945
Wallace Air Station. This 101 hectares of base land located at the end of Poro Point in San Fernando was acquired in 1903 for the United States Cavalry. It was the home of the 848th Aircraft Control and Warning Squadron which provided logistics and administrative support to other radar detachments under its chain of command. Formally turned-over by the United States to the Republic of the Philippines on September 16, 1991, the Bases conversion Development Authority is overseeing the plans for the conversion of the area into a prime tourism and industrial estate.
Ilocano is the common dialect. The residents of the coastal barangay of Sto. Tomas and Rosario also speak Pangasinense while the cultural communities in the towns bordering the Cordillera speak Ibaloi or Kankanacy. English and Filipino remain as basic tools of instruction in schools.