Barangay San Diego

Barangay San Diego is a small barangay in the municipality of Tagkawayan, located in the province of Quezon, in the CALABARZON region of the Philippines.

According to the 2020 Philippine census, Barangay San Diego had a population of 511. This made it the 37th largest of 45 barangays in Tagkawayan by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Diego accounted for approximately 0.95% of the total population of Tagkawayan, which stood at 54,003 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay San Diego changed from 491 to 511, a shift of +4.1% over the five-year period. This places the barangay among those with growing populations in Tagkawayan. Barangay San Diego is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Tagkawayan is a municipality comprising 45 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 Quezon, which contains 1,242 barangays across its component cities and municipalities, Barangay San Diego ranks 923rd by 2020 population. Quezon 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 San Diego 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.