Barangay Caysio

Classified as a large barangay, Barangay Caysio is one of the administrative divisions of Santa Maria in Bulacan, Central Luzon, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Caysio had a population of 14,979. This made it the 6th largest of 24 barangays in Santa Maria by population, placing it in the upper half of the municipality. Residents of Barangay Caysio accounted for approximately 5.17% of the total population of Santa Maria, which stood at 289,820 in the same census year.

The barangay recorded 14,365 residents in the 2015 intercensal count and 14,979 residents in the 2020 Census — a net change of +4.3%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay Caysio as urban, reflecting the density and built-up character of the area.

Santa Maria is a municipality comprising 24 barangays, and serves as the governing unit directly responsible for local services in Barangay Caysio, including public health, sanitation, peace and order, and civil registration. Within the wider province of Bulacan, which contains 569 barangays across its component cities and municipalities, Barangay Caysio ranks 38th by 2020 population. Bulacan 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.