Barangay San Diego

Situated in Luisiana, Laguna, Barangay San Diego is one of 23 barangays that make up the municipality within CALABARZON.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Diego had a population of 2,705. This made it the 3rd largest of 23 barangays in Luisiana by population, placing it among the most populous barangays of the municipality. Residents of Barangay San Diego accounted for approximately 12.97% of the total population of Luisiana, which stood at 20,859 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Diego moving from 2,669 residents to 2,705 residents, an intercensal change of +1.3%. The trajectory indicates a slowly expanding community. The Philippine Statistics Authority classifies Barangay San Diego as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Luisiana is a municipality comprising 23 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 Laguna, which contains 681 barangays across its component cities and municipalities, Barangay San Diego ranks 313th by 2020 population. Laguna 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.