Barangay Tambongon

Classified as a small barangay, Barangay Tambongon is one of the administrative divisions of Viga in Catanduanes, Bicol Region, Philippines.

According to the 2020 Philippine census, Barangay Tambongon had a population of 1,110. This made it the 5th largest of 31 barangays in Viga by population, placing it in the upper half of the municipality. Residents of Barangay Tambongon accounted for approximately 4.85% of the total population of Viga, which stood at 22,869 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Tambongon moving from 1,163 residents to 1,110 residents, an intercensal change of -4.6%. The trajectory indicates a contracting community. Barangay Tambongon is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Viga is a municipality comprising 31 barangays, and serves as the governing unit directly responsible for local services in Barangay Tambongon, including public health, sanitation, peace and order, and civil registration. Within the wider province of Catanduanes, which contains 315 barangays across its component cities and municipalities, Barangay Tambongon ranks 68th by 2020 population. Catanduanes 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.