The Municipality of Jose Abad Santos was formerly a part of Malita town. It was later established as a separate town on August 1, 1948 and was originally named “Trinidad”. The barrio of Caburan became its poblacion or town center. In 1954, the municipality was renamed to Jose Abad Santos by Republic Act no. 1206, in honor of the former Chief Justice of the Supreme Court of the Philippines, who died a martyr during World War II.
Jose Abad Santos is politically subdivided into 26 barangays.
- Caburan Big
- Caburan Small (Pob.)
- San Isidro