Barangay Bigain South

Situated in San Jose, Batangas, Barangay Bigain South is one of 33 barangays that make up the municipality within CALABARZON.

According to the 2020 Philippine census, Barangay Bigain South had a population of 1,057. This made it the 28th largest of 33 barangays in San Jose by population, placing it among the smaller barangays of the municipality. Residents of Barangay Bigain South accounted for approximately 1.32% of the total population of San Jose, which stood at 79,868 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Bigain South moving from 1,093 residents to 1,057 residents, an intercensal change of -3.3%. The trajectory indicates a contracting community. Barangay Bigain South is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Jose is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Bigain South, including public health, sanitation, peace and order, and civil registration. Within the wider province of Batangas, which contains 1,078 barangays across its component cities and municipalities, Barangay Bigain South ranks 849th by 2020 population. Batangas 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 Bigain South 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.