Barangay Casab-ahan

Classified as a small barangay, Barangay Casab-ahan is one of the administrative divisions of Gandara in Samar, Eastern Visayas, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Casab-ahan had a population of 962. This made it the 10th largest of 69 barangays in Gandara by population, placing it in the upper half of the municipality. Residents of Barangay Casab-ahan accounted for approximately 2.73% of the total population of Gandara, which stood at 35,242 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Casab-ahan changed from 1,132 to 962, a shift of -15.0% over the five-year period. This places the barangay among those with contracting populations in Gandara. The Philippine Statistics Authority classifies Barangay Casab-ahan as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Gandara is a municipality comprising 69 barangays, and serves as the governing unit directly responsible for local services in Barangay Casab-ahan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Samar, which contains 951 barangays across its component cities and municipalities, Barangay Casab-ahan ranks 250th by 2020 population. Samar 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.