Barangay Guimod Sur

Situated in San Juan, Ilocos Sur, Barangay Guimod Sur is one of 32 barangays that make up the municipality within Ilocos Region.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Guimod Sur had a population of 959. This made it the 11th largest of 32 barangays in San Juan by population, placing it in the middle tier of the municipality. Residents of Barangay Guimod Sur accounted for approximately 3.60% of the total population of San Juan, which stood at 26,674 in the same census year.

The barangay recorded 997 residents in the 2015 intercensal count and 959 residents in the 2020 Census — a net change of -3.8%, consistent with a contracting settlement. The Philippine Statistics Authority classifies Barangay Guimod Sur as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Juan is a municipality comprising 32 barangays, and serves as the governing unit directly responsible for local services in Barangay Guimod Sur, including public health, sanitation, peace and order, and civil registration. Within the wider province of Ilocos Sur, which contains 768 barangays across its component cities and municipalities, Barangay Guimod Sur ranks 271st by 2020 population. Ilocos Sur 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.