Barangay Rosario

Barangay Rosario forms part of City of San Pedro, a city in Laguna, and is classified as a large barangay.

According to the 2020 Philippine census, Barangay Rosario had a population of 5,911. This made it the 15th largest of 27 barangays in City of San Pedro by population, placing it in the middle tier of the city. Residents of Barangay Rosario accounted for approximately 1.81% of the total population of City of San Pedro, which stood at 326,001 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Rosario changed from 5,613 to 5,911, a shift of +5.3% over the five-year period. This places the barangay among those with growing populations in City of San Pedro. Barangay Rosario is officially classified as urban, reflecting the density and built-up character of the area.

City of San Pedro is a city comprising 27 barangays, and serves as the governing unit directly responsible for local services in Barangay Rosario, 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 Rosario ranks 149th 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 Rosario 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.