Barangay Calubcub I

Situated in San Juan, Batangas, Barangay Calubcub I is one of 42 barangays that make up the municipality within CALABARZON.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Calubcub I had a population of 2,264. This made it the 23rd largest of 42 barangays in San Juan by population, placing it in the middle tier of the municipality. Residents of Barangay Calubcub I accounted for approximately 1.98% of the total population of San Juan, which stood at 114,068 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Calubcub I changed from 2,206 to 2,264, a shift of +2.6% over the five-year period. This places the barangay among those with growing populations in San Juan. The Philippine Statistics Authority classifies Barangay Calubcub I as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Juan is a municipality comprising 42 barangays, and serves as the governing unit directly responsible for local services in Barangay Calubcub I, including public health, sanitation, peace and order, and civil registration. Within the wider province of Batangas, which contains 1,078 barangays across its component cities and municipalities, Barangay Calubcub I ranks 459th by 2020 population. Batangas is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Calubcub 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.