Barangay Casay Viejo

Situated in Anini-Y, Antique, Barangay Casay Viejo is one of 23 barangays that make up the municipality within Western Visayas.

According to the 2020 Philippine census, Barangay Casay Viejo had a population of 444. This made it the 20th largest of 23 barangays in Anini-Y by population, placing it among the smaller barangays of the municipality. Residents of Barangay Casay Viejo accounted for approximately 2.02% of the total population of Anini-Y, which stood at 22,018 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Casay Viejo changed from 421 to 444, a shift of +5.5% over the five-year period. This places the barangay among those with growing populations in Anini-Y. Barangay Casay Viejo is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Anini-Y is a municipality comprising 23 barangays, and serves as the governing unit directly responsible for local services in Barangay Casay Viejo, including public health, sanitation, peace and order, and civil registration. Within the wider province of Antique, which contains 590 barangays across its component cities and municipalities, Barangay Casay Viejo ranks 466th by 2020 population. Antique is classified as a 2nd 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.