Barangay Calassitan

Barangay Calassitan forms part of Santo Niño, a municipality in Cagayan, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Calassitan had a population of 1,174. This made it the 8th largest of 31 barangays in Santo Niño by population, placing it in the upper half of the municipality. Residents of Barangay Calassitan accounted for approximately 4.11% of the total population of Santo Niño, which stood at 28,537 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Calassitan changed from 1,136 to 1,174, a shift of +3.3% over the five-year period. This places the barangay among those with growing populations in Santo Niño. The Philippine Statistics Authority classifies Barangay Calassitan as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Santo Niño is a municipality comprising 31 barangays, and serves as the governing unit directly responsible for local services in Barangay Calassitan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Cagayan, which contains 820 barangays across its component cities and municipalities, Barangay Calassitan ranks 425th by 2020 population. Cagayan is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Calassitan 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.