What is the population of San Guillermo?

The population of San Guillermo is 20,200.

Where is San Guillermo located?

San Guillermo is located at latitude 16.7333300 and longitude 121.8666700. It is in Philippines.

The area of San Guillermo is 325.49 km².

San Guillermo is in the Asia/Manila time zone.

The population of San Guillermo has increased from 9,970 (1970) to 20,200 (2015), a change of 102.6%.

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

Population	20,200
Country	Philippines
State	Cagayan Valley (Philippines)
County	Province of Isabela
Postal code	3308
Phone Area Codes	78
Area	325.49 km²
Official name	Municipality of San Guillermo
Latitude & Longitude	16.7333,121.8667
Establishment	January 01, 1967 (59 years ago)
Time Zone	Asia/Manila
Local time	10:31:37 (13th May 2026)

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

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Official website of San Guillermo

Official Website

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