San Guillermo, Cagayan Valley

San Guillermo: Municipality of the Philippines in the province of Isabela

About

Quick Facts about San Guillermo

Population : 20,200
Country : Philippines
State : Cagayan Valley (Philippines)
County : Province of Isabela
Head of government : mayor
Postal code : 3308
Phone Area Codes : 78
Area : 325.49 km2
Official name : Municipality of San Guillermo
Establishment : January 01, 1967 (58 years ago)
Time Zone : Asia/Manila
Local time : 22:11:16 (5th December 2025)

Geography

San Guillermo is located at 16°43'60"N 121°52'0"E (16.7333300, 121.8666700).

San Guillermo map

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Demographics

Year Population % Change Method
1970 9,970 - census
1975 5,573 -78.9% census
1980 6,985 20.21% census
1990 10,700 34.72% census
1995 12,506 14.44% census
2000 13,338 6.24% census
2007 16,865 20.91% census
2010 18,423 8.46% census
2015 20,200 8.8% census

San Guillermo

Other places with the same name (2)