Diffun

Diffun
Municipality of Diffun
Diffun Town Hall
Map of Quirino with Diffun highlighted
Interactive map of Diffun
Diffun
Location within the Philippines
Coordinates: 16°35′37″N 121°30′09″E / 16.5936°N 121.5025°E / 16.5936; 121.5025
CountryPhilippines
RegionCagayan Valley
ProvinceQuirino
District Lone district
Barangays33 (see Barangays)
Government
 • TypeSangguniang Bayan
 • MayorMay G. Calaunan
 • Vice MayorMarlito G. Corpuz
 • RepresentativeJunie E. Cua
 • Municipal Council
Members
  • Cesar M. Agustin
  • Ma. Karen A. Baldonado-Guillermo
  • Gloria C. Antolin
  • Renato M. Antolin
  • Elpidio G. Javonillo
  • Michael A. Lidiang
  • Roseller A. Escobar
  • Cesar C. Valencia
 • Electorate32,761 voters (2025)
Area
 • Total
320.10 km2 (123.59 sq mi)
Elevation
160 m (520 ft)
Highest elevation
551 m (1,808 ft)
Lowest elevation
95 m (312 ft)
Population
 (2024 census)
 • Total
58,254
 • Density181.99/km2 (471.34/sq mi)
 • Households
13,942
Economy
 • Income class2nd municipal income class
 • Poverty incidence
10.07
% (2021)
 • Revenue₱ 317.3 million (2022)
 • Assets₱ 790.9 million (2022)
 • Expenditure₱ 240.3 million (2022)
 • Liabilities₱ 225.9 million (2022)
Service provider
 • ElectricityQuirino Electric Cooperative (QUIRELCO)
Time zoneUTC+8 (PST)
ZIP code
3401
PSGC
IDD:area code+63 (0)78
Native languagesIlocano
Bugkalot
Tagalog
Websitewww.diffun-quirino.gov.ph

Diffun, officially the Municipality of Diffun (Ilocano: Ili ti Diffun; Tagalog: Bayan ng Diffun), is a municipality in the province of Quirino, Philippines. According to the 2024 census, it has a population of 58,254 people, making it the most populous town in the province.

Commercial establishments proliferated along the provincial road due to its proximity to Santiago City as the main commercial hub of the region.