Barangay Biay

Barangay Biay forms part of Santa Cruz, a municipality in Zambales, and is classified as a mid-sized barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Biay had a population of 2,645. This made it the 12th largest of 25 barangays in Santa Cruz by population, placing it in the middle tier of the municipality. Residents of Barangay Biay accounted for approximately 4.14% of the total population of Santa Cruz, which stood at 63,839 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Biay moving from 2,379 residents to 2,645 residents, an intercensal change of +11.2%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Biay as urban, reflecting the density and built-up character of the area.

Santa Cruz is a municipality comprising 25 barangays, and serves as the governing unit directly responsible for local services in Barangay Biay, 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 Biay ranks 81st 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.

Like every Philippine barangay, Barangay Biay is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.