Barangay Calinaoan Sur

Situated in Delfin Albano, Isabela, Barangay Calinaoan Sur is one of 29 barangays that make up the municipality within Cagayan Valley.

According to the 2020 Philippine census, Barangay Calinaoan Sur had a population of 543. This made it the 24th largest of 29 barangays in Delfin Albano by population, placing it among the smaller barangays of the municipality. Residents of Barangay Calinaoan Sur accounted for approximately 1.81% of the total population of Delfin Albano, which stood at 29,928 in the same census year.

The barangay recorded 445 residents in the 2015 intercensal count and 543 residents in the 2020 Census — a net change of +22.0%, consistent with a growing settlement. Barangay Calinaoan Sur is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Delfin Albano is a municipality comprising 29 barangays, and serves as the governing unit directly responsible for local services in Barangay Calinaoan Sur, 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 Calinaoan Sur ranks 917th 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.