Barangay Rosario

Situated in Lopez, Quezon, Barangay Rosario is one of 95 barangays that make up the municipality within CALABARZON.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Rosario had a population of 1,092. This made it the 27th largest of 95 barangays in Lopez by population, placing it in the upper half of the municipality. Residents of Barangay Rosario accounted for approximately 1.15% of the total population of Lopez, which stood at 94,657 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Rosario moving from 1,098 residents to 1,092 residents, an intercensal change of -0.5%. The trajectory indicates a broadly stable community. The Philippine Statistics Authority classifies Barangay Rosario as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Lopez is a municipality comprising 95 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 Quezon, which contains 1,242 barangays across its component cities and municipalities, Barangay Rosario ranks 561st 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 Rosario 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.