Barangay Casilay

Barangay Casilay forms part of Sierra Bullones, a municipality in Bohol, and is classified as a very small barangay.

According to the 2020 Philippine census, Barangay Casilay had a population of 344. This made it the 22nd largest of 22 barangays in Sierra Bullones by population, placing it among the smaller barangays of the municipality. Residents of Barangay Casilay accounted for approximately 1.32% of the total population of Sierra Bullones, which stood at 26,095 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Casilay moving from 385 residents to 344 residents, an intercensal change of -10.6%. The trajectory indicates a contracting community. Barangay Casilay is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Sierra Bullones is a municipality comprising 22 barangays, and serves as the governing unit directly responsible for local services in Barangay Casilay, including public health, sanitation, peace and order, and civil registration. Within the wider province of Bohol, which contains 1,109 barangays across its component cities and municipalities, Barangay Casilay ranks 1031st by 2020 population. Bohol 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.