Bagac is a third class Muicipaliy 2010 census, it has a population of 25,568 people. With an area of 23,120 hectares (231.2 km2), Bagac is the largest municipality in the province of Bataan.
Barangays:
- Bagumbayan (Pob.)
- Banawang
- Binuangan
- Binukawan
- Ibaba (Poblacion)
- Ibis
- Pag-asa (Wawa-Sibacan)
- Parang
- Paysawan
- Quinawan
- San Antonio
- Saysain
- Tabing-Ilog (Pob.)
- Atilano L. Ricardo