Barangay Calog Sur

Barangay Calog Sur forms part of Abulug, a municipality in Cagayan, and is classified as a mid-sized barangay.

According to the 2020 Philippine census, Barangay Calog Sur had a population of 2,685. This made it the 4th largest of 20 barangays in Abulug by population, placing it in the upper half of the municipality. Residents of Barangay Calog Sur accounted for approximately 7.76% of the total population of Abulug, which stood at 34,579 in the same census year.

The barangay recorded 2,527 residents in the 2015 intercensal count and 2,685 residents in the 2020 Census — a net change of +6.3%, consistent with a growing settlement. Barangay Calog Sur is officially classified as urban, reflecting the density and built-up character of the area.

Abulug is a municipality comprising 20 barangays, and serves as the governing unit directly responsible for local services in Barangay Calog Sur, including public health, sanitation, peace and order, and civil registration. Within the wider province of Cagayan, which contains 820 barangays across its component cities and municipalities, Barangay Calog Sur ranks 97th by 2020 population. Cagayan is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Calog Sur 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.