Barangay San Sebastian

Classified as a large barangay, Barangay San Sebastian is one of the administrative divisions of Hagonoy in Bulacan, Central Luzon, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Sebastian had a population of 7,522. This made it the 4th largest of 26 barangays in Hagonoy by population, placing it in the upper half of the municipality. Residents of Barangay San Sebastian accounted for approximately 5.64% of the total population of Hagonoy, which stood at 133,448 in the same census year.

The barangay recorded 8,193 residents in the 2015 intercensal count and 7,522 residents in the 2020 Census — a net change of -8.2%, consistent with a contracting settlement. The Philippine Statistics Authority classifies Barangay San Sebastian as urban, reflecting the density and built-up character of the area.

Hagonoy is a municipality comprising 26 barangays, and serves as the governing unit directly responsible for local services in Barangay San Sebastian, including public health, sanitation, peace and order, and civil registration. Within the wider province of Bulacan, which contains 569 barangays across its component cities and municipalities, Barangay San Sebastian ranks 148th by 2020 population. Bulacan is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay San Sebastian 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.