Barangay San Juan (Pob.)

Classified as a small barangay, Barangay San Juan (Pob.) is one of the administrative divisions of Castillejos in Zambales, Central Luzon, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Juan (Pob.) had a population of 989. This made it the 13th largest of 14 barangays in Castillejos by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Juan (Pob.) accounted for approximately 1.46% of the total population of Castillejos, which stood at 67,889 in the same census year.

The barangay recorded 991 residents in the 2015 intercensal count and 989 residents in the 2020 Census — a net change of -0.2%, consistent with a broadly stable settlement. The Philippine Statistics Authority classifies Barangay San Juan (Pob.) as urban, reflecting the density and built-up character of the area.

Castillejos is a municipality comprising 14 barangays, and serves as the governing unit directly responsible for local services in Barangay San Juan (Pob.), including public health, sanitation, peace and order, and civil registration. Within the wider province of Zambales, which contains 247 barangays across its component cities and municipalities, Barangay San Juan (Pob.) ranks 192nd by 2020 population. Zambales is classified as a 2nd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.