Barangay Poblacion I

Classified as a large barangay, Barangay Poblacion I is one of the administrative divisions of Santiago in Agusan Del Norte, Caraga, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Poblacion I had a population of 6,374. This made it the 1st largest of 9 barangays in Santiago by population, placing it among the most populous barangays of the municipality. Residents of Barangay Poblacion I accounted for approximately 22.24% of the total population of Santiago, which stood at 28,657 in the same census year.

The barangay recorded 5,418 residents in the 2015 intercensal count and 6,374 residents in the 2020 Census — a net change of +17.6%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay Poblacion I as urban, reflecting the density and built-up character of the area.

Santiago is a municipality comprising 9 barangays, and serves as the governing unit directly responsible for local services in Barangay Poblacion I, including public health, sanitation, peace and order, and civil registration. Within the wider province of Agusan Del Norte, which contains 253 barangays across its component cities and municipalities, Barangay Poblacion I ranks 4th by 2020 population. Agusan Del Norte is classified as a 3rd 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.