Barangay Bagbag I

Classified as a large barangay, Barangay Bagbag I is one of the administrative divisions of Rosario in Cavite, CALABARZON, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Bagbag I had a population of 6,032. This made it the 6th largest of 20 barangays in Rosario by population, placing it in the upper half of the municipality. Residents of Barangay Bagbag I accounted for approximately 5.44% of the total population of Rosario, which stood at 110,807 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Bagbag I changed from 6,070 to 6,032, a shift of -0.6% over the five-year period. This places the barangay among those with broadly stable populations in Rosario. The Philippine Statistics Authority classifies Barangay Bagbag I as urban, reflecting the density and built-up character of the area.

Rosario is a municipality comprising 20 barangays, and serves as the governing unit directly responsible for local services in Barangay Bagbag I, including public health, sanitation, peace and order, and civil registration. Within the wider province of Cavite, which contains 829 barangays across its component cities and municipalities, Barangay Bagbag I ranks 178th by 2020 population. Cavite is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Bagbag I 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.