Barangay Casingsingan Sur

Classified as a small barangay, Barangay Casingsingan Sur is one of the administrative divisions of Amulung in Cagayan, Cagayan Valley, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Casingsingan Sur had a population of 786. This made it the 28th largest of 47 barangays in Amulung by population, placing it in the middle tier of the municipality. Residents of Barangay Casingsingan Sur accounted for approximately 1.56% of the total population of Amulung, which stood at 50,336 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Casingsingan Sur moving from 712 residents to 786 residents, an intercensal change of +10.4%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Casingsingan Sur as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Amulung is a municipality comprising 47 barangays, and serves as the governing unit directly responsible for local services in Barangay Casingsingan 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 Casingsingan Sur ranks 615th 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.

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.