Barangay San Luis

Classified as a mid-sized barangay, Barangay San Luis is one of the administrative divisions of Tuao in Cagayan, Cagayan Valley, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Luis had a population of 2,460. This made it the 8th largest of 32 barangays in Tuao by population, placing it in the upper half of the municipality. Residents of Barangay San Luis accounted for approximately 3.85% of the total population of Tuao, which stood at 63,970 in the same census year.

The barangay recorded 2,369 residents in the 2015 intercensal count and 2,460 residents in the 2020 Census — a net change of +3.8%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay San Luis as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Tuao is a municipality comprising 32 barangays, and serves as the governing unit directly responsible for local services in Barangay San Luis, 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 San Luis ranks 131st 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.

Like every Philippine barangay, Barangay San Luis is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.