Barangay San Juan Bag-o

Barangay San Juan Bag-o forms part of Bulan, a municipality in Sorsogon, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Juan Bag-o had a population of 1,688. This made it the 24th largest of 63 barangays in Bulan by population, placing it in the middle tier of the municipality. Residents of Barangay San Juan Bag-o accounted for approximately 1.60% of the total population of Bulan, which stood at 105,190 in the same census year.

The barangay recorded 1,559 residents in the 2015 intercensal count and 1,688 residents in the 2020 Census — a net change of +8.3%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay San Juan Bag-o as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Bulan is a municipality comprising 63 barangays, and serves as the governing unit directly responsible for local services in Barangay San Juan Bag-o, including public health, sanitation, peace and order, and civil registration. Within the wider province of Sorsogon, which contains 541 barangays across its component cities and municipalities, Barangay San Juan Bag-o ranks 167th by 2020 population. Sorsogon 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 San Juan Bag-o 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.