Barangay San Diego

Classified as a small barangay, Barangay San Diego is one of the administrative divisions of Bauan in Batangas, CALABARZON, Philippines.

According to the 2020 Philippine census, Barangay San Diego had a population of 509. This made it the 36th largest of 40 barangays in Bauan by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Diego accounted for approximately 0.56% of the total population of Bauan, which stood at 90,819 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Diego moving from 521 residents to 509 residents, an intercensal change of -2.3%. The trajectory indicates a contracting community. Barangay San Diego is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Bauan is a municipality comprising 40 barangays, and serves as the governing unit directly responsible for local services in Barangay San Diego, 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 San Diego ranks 1016th 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.

Barangay San Diego 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.