Barangay San Guillermo

Situated in Morong, Rizal, Barangay San Guillermo is one of 8 barangays that make up the municipality within CALABARZON.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Guillermo had a population of 12,758. This made it the 2nd largest of 8 barangays in Morong by population, placing it in the upper half of the municipality. Residents of Barangay San Guillermo accounted for approximately 17.93% of the total population of Morong, which stood at 71,151 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Guillermo moving from 9,722 residents to 12,758 residents, an intercensal change of +31.2%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay San Guillermo as urban, reflecting the density and built-up character of the area.

Morong is a municipality comprising 8 barangays, and serves as the governing unit directly responsible for local services in Barangay San Guillermo, including public health, sanitation, peace and order, and civil registration. Within the wider province of Rizal, which contains 189 barangays across its component cities and municipalities, Barangay San Guillermo ranks 61st by 2020 population. Rizal 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.