San Antonio is bounded by the Dario River in the East, Judge Juan Luna Street in the West, Pat Senador and Baler Streets in the south and the Halang Creek in the north. It is a part of the San Francisco Del Monte district in Quezon City. Nearby barangays are Veterans Village, Bahay Toro, Bungad, Katipunan, del Monte and Paltok.
San Antonio is a part of the San Francisco del Monte area. San Francisco del Monte was founded on February 17, 1590. It was meant to be a place for retreat for residents in Intramuros in Manila. The street's old name Retiro, came from the word retiro, meaning "retreat", because it offers a place of solitude nestled atop a hill to many retreatants. The church located in San Francisco del Monte was the first building in the area. It is named after its benevolent Spanish friar and founder, St. Francis. It was an independent town during the Spanish era that had an area of 250 acres of land filled with wildlife and trees. It was later absorbed by Quezon City when it was created. Today, it is a heavily populated district. Although it contains many residential areas such as Barangay San Antonio, there are many industrial facilities here, mostly found along Judge Juan Luna street. The two main intersections of this area are Roosevelt Ave. and Del Monte Ave. Originally around 2.5 km² in area. It extended beyond Project 7and 8, all the way out to Timog Avenue area. Currently, it is composed of Brgy. Paraiso, San Antonio, Paltok, Masambong, Damayan and Del Monte. Former residents include the late Filipino actor Fernando Poe, Jr. whose ancestral home can still be found along Roosevelt Avenue.
As of the 2007 census of the National Statistics Office, the population of Barangay San Antonio is 24,667.
Peace and Order
Barangay San Antonio used to be notorious in regard its management in its peace and order situation. Currently, the entireties of the barangay are surrounded by "barangay tanods" who patrol the jurisdiction against any form of criminality.
Basic services
The newly elected barangay officials headed by Punong Barangay Nestor Berroya has appropriated for the purchase of a barangay fire truck in order to be the first line of defense when a disaster such as a fire arises. This move included Barangay San Antonio as one of the few barangays in the country to have a very own responsive barangay fire truck that would protect and save the lives and properties of their constituents.
Barangay San Antonio was one of the hardest hit barangay in Quezon City by Typhoon Ondoy. The level of flood waters from Halang Creek and a nearby stream reached as high as 30 feet especially in the areas such as West Riverside Street, Santiago Street, Guerrero Street and Fernandez Streets. Many houses were destroyed by raging flood waters and countless properties were damaged. The barangay council temporarily used the barangay covered court in San Jose Street as well as the Sinag-Tala Elementary School as evacuation area. Massive relief operation for almost 2,000 affected families were launched in order to help the victims of the flooding. One drowning casualty was recorded/reported.
