San Agustin, Isabela
| San Agustin | |
|---|---|
| Municipality of San Agustin | |
| Nickname: Crossbred Capital of the Philippines | |
| Map of Isabela with San Agustin highlighted | |
| OpenStreetMap | |
| Location within the Philippines | |
| Coordinates: 16°31′N 121°45′E / 16.52°N 121.75°E | |
| Country | Philippines | 
| Region | Cagayan Valley | 
| Province | Isabela | 
| District | 4th district | 
| Named after | St. Augustine of Hippo | 
| Barangays | 23 (see Barangays) | 
| Government | |
| • Type | Sangguniang Bayan | 
| • Mayor | Cesar A. Mondala | 
| • Vice Mayor | Oliver D. Micu | 
| • Representative | Joseph S. Tan | 
| • Electorate | 15,378 voters (2025) | 
| Area | |
|  • Total | 278.40 km2 (107.49 sq mi) | 
| Elevation | 125 m (410 ft) | 
| Highest elevation | 309 m (1,014 ft) | 
| Lowest elevation | 84 m (276 ft) | 
| Population  (2020 census) | |
|  • Total | 22,096 | 
| • Density | 79/km2 (210/sq mi) | 
| • Households | 5,544 | 
| Economy | |
| • Income class | 3rd municipal income class | 
| • Poverty incidence | 11.83 | 
| • Revenue | ₱ 195.3 million (2022) | 
| • Assets | ₱ 410 million (2022) | 
| • Expenditure | ₱ 143.9 million (2022) | 
| • Liabilities | ₱ 42.87 million (2022) | 
| Service provider | |
| • Electricity | Isabela 1 Electric Cooperative (ISELCO 1) | 
| Time zone | UTC+8 (PST) | 
| ZIP code | 3314 | 
| PSGC | |
| IDD : area code | +63 (0)78 | 
| Native languages | Ilocano Bugkalot Tagalog | 
| Website | www | 
San Agustin, officially the Municipality of San Agustin (Ilocano: Ili ti San Agustin; Tagalog: Bayan ng San Agustin), is a municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 22,096 people.