Barangay San Gregorio (Pob.)

Classified as a small barangay, Barangay San Gregorio (Pob.) is one of the administrative divisions of San Antonio in Zambales, Central Luzon, Philippines.

According to the 2020 Philippine census, Barangay San Gregorio (Pob.) had a population of 1,013. This made it the 13th largest of 14 barangays in San Antonio by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Gregorio (Pob.) accounted for approximately 2.70% of the total population of San Antonio, which stood at 37,450 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Gregorio (Pob.) moving from 931 residents to 1,013 residents, an intercensal change of +8.8%. The trajectory indicates a growing community. Barangay San Gregorio (Pob.) is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Antonio is a municipality comprising 14 barangays, and serves as the governing unit directly responsible for local services in Barangay San Gregorio (Pob.), including public health, sanitation, peace and order, and civil registration. Within the wider province of Zambales, which contains 247 barangays across its component cities and municipalities, Barangay San Gregorio (Pob.) ranks 191st by 2020 population. Zambales is classified as a 2nd 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.