Barangay Estrella

Classified as a very small barangay, Barangay Estrella is one of the administrative divisions of San Guillermo in Isabela, Cagayan Valley, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Estrella had a population of 479. This made it the 19th largest of 26 barangays in San Guillermo by population, placing it in the middle tier of the municipality. Residents of Barangay Estrella accounted for approximately 2.29% of the total population of San Guillermo, which stood at 20,915 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Estrella moving from 456 residents to 479 residents, an intercensal change of +5.0%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Estrella as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Guillermo is a municipality comprising 26 barangays, and serves as the governing unit directly responsible for local services in Barangay Estrella, including public health, sanitation, peace and order, and civil registration. Within the wider province of Isabela, which contains 1,055 barangays across its component cities and municipalities, Barangay Estrella ranks 953rd by 2020 population. Isabela is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.