Mallig is a fourth class municipality in the province of Isabela, Philippines. Mallig borders in the west with the town of Paracelis, Mountain Province.
According to the 2010 census, it has a population of 28,345 people.
Mallig was formed into a town in 1952. The territory comprising Mallig was taken from different neighboring towns:
- from Roxas: barrios of Holy Friday, San Jose (East), and San Jose (West)
- from Ilagan City: barrios of Casili, Olango Primero, Olango Segundo, San Jose Nuevo, and Manano
- from Tumauini: barrios of Barucbuc, Siempre Viva, Bimmonton, Pasurgong, Manga, and Settlement No. 1
- from Sto. Tomas: barrios of Abut and Minagbag
Mallig is politically subdivided into 18 barangays.
- San Pedro (Barucbuc Sur)
- Centro I (Pob.)
- Holy Friday
- Centro II (Pob.)
- San Jose Norte I
- San Jose Sur
- Siempre Viva Norte
- San Jose Norte II
- San Ramon
- Siempre Viva Sur
|Population census of Mallig
|Source: National Statistics Office