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Diffun is a 3rd class municipality in the province of Quirino, Philippines. According to the 2000 census, it has a population of 39,489 people in 8,274 households.
Diffun is politically subdivided into 33 barangays.
16°36′N 121°28′E / 16.600°N 121.467°E / 16.600; 121.467
Province of Quirino