Barangay Illuru Sur

Barangay Illuru Sur forms part of Rizal, a municipality in Cagayan, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Illuru Sur had a population of 1,259. This made it the 2nd largest of 29 barangays in Rizal by population, placing it among the most populous barangays of the municipality. Residents of Barangay Illuru Sur accounted for approximately 6.60% of the total population of Rizal, which stood at 19,077 in the same census year.

The barangay recorded 1,228 residents in the 2015 intercensal count and 1,259 residents in the 2020 Census — a net change of +2.5%, consistent with a growing settlement. Barangay Illuru Sur is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Rizal is a municipality comprising 29 barangays, and serves as the governing unit directly responsible for local services in Barangay Illuru 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 Illuru Sur ranks 391st 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 Illuru 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.