Barangay San Ildefonso

Barangay San Ildefonso forms part of Alaminos, a municipality in Laguna, and is classified as a mid-sized barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Ildefonso had a population of 3,035. This made it the 10th largest of 15 barangays in Alaminos by population, placing it in the middle tier of the municipality. Residents of Barangay San Ildefonso accounted for approximately 5.88% of the total population of Alaminos, which stood at 51,619 in the same census year.

The barangay recorded 2,821 residents in the 2015 intercensal count and 3,035 residents in the 2020 Census — a net change of +7.6%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay San Ildefonso as urban, reflecting the density and built-up character of the area.

Alaminos is a municipality comprising 15 barangays, and serves as the governing unit directly responsible for local services in Barangay San Ildefonso, 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 Ildefonso ranks 276th 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.

Like every Philippine barangay, Barangay San Ildefonso 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.