Barangay Bigain I

Barangay Bigain I forms part of San Jose, a municipality in Batangas, and is classified as a mid-sized barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Bigain I had a population of 2,351. This made it the 14th largest of 33 barangays in San Jose by population, placing it in the middle tier of the municipality. Residents of Barangay Bigain I accounted for approximately 2.94% of the total population of San Jose, which stood at 79,868 in the same census year.

The barangay recorded 2,327 residents in the 2015 intercensal count and 2,351 residents in the 2020 Census — a net change of +1.0%, consistent with a slowly expanding settlement. The Philippine Statistics Authority classifies Barangay Bigain I 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 I, 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 I ranks 426th 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.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.