Barangay Balaybay

Barangay Balaybay is a large barangay in the municipality of Castillejos, located in the province of Zambales, in the Central Luzon region of the Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Balaybay had a population of 10,127. This made it the 3rd largest of 14 barangays in Castillejos by population, placing it in the upper half of the municipality. Residents of Barangay Balaybay accounted for approximately 14.92% of the total population of Castillejos, which stood at 67,889 in the same census year.

The barangay recorded 11,064 residents in the 2015 intercensal count and 10,127 residents in the 2020 Census — a net change of -8.5%, consistent with a contracting settlement. The Philippine Statistics Authority classifies Barangay Balaybay 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 Balaybay, 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 Balaybay ranks 10th 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.