Barangay Sergio Bayan

Barangay Sergio Bayan forms part of Calumpit, a municipality in Bulacan, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Sergio Bayan had a population of 1,727. This made it the 27th largest of 29 barangays in Calumpit by population, placing it among the smaller barangays of the municipality. Residents of Barangay Sergio Bayan accounted for approximately 1.46% of the total population of Calumpit, which stood at 118,471 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Sergio Bayan changed from 1,967 to 1,727, a shift of -12.2% over the five-year period. This places the barangay among those with contracting populations in Calumpit. Barangay Sergio Bayan is officially classified as urban, reflecting the density and built-up character of the area.

Calumpit is a municipality comprising 29 barangays, and serves as the governing unit directly responsible for local services in Barangay Sergio Bayan, 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 Sergio Bayan ranks 514th 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.

Barangay Sergio Bayan is governed by an elected Sangguniang Barangay composed of a Punong Barangay and seven kagawads, with the Sangguniang Kabataan representing the youth. The next BSKE, set for Monday, November 2, 2026, will elect officials to four-year terms as provided under Republic Act No. 12232.