Barangay Casilak San Agustin

Classified as a small barangay, Barangay Casilak San Agustin is one of the administrative divisions of Tudela in Misamis Occidental, Northern Mindanao, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Casilak San Agustin had a population of 550. This made it the 27th largest of 33 barangays in Tudela by population, placing it among the smaller barangays of the municipality. Residents of Barangay Casilak San Agustin accounted for approximately 1.92% of the total population of Tudela, which stood at 28,599 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Casilak San Agustin moving from 607 residents to 550 residents, an intercensal change of -9.4%. The trajectory indicates a contracting community. The Philippine Statistics Authority classifies Barangay Casilak San Agustin as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Tudela is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Casilak San Agustin, including public health, sanitation, peace and order, and civil registration. Within the wider province of Misamis Occidental, which contains 490 barangays across its component cities and municipalities, Barangay Casilak San Agustin ranks 371st by 2020 population. Misamis Occidental is classified as a 2nd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Casilak San Agustin 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.