Based on the Philippine Statistics Authority (PSA) census of population for the year 2009 and 2015, the municipality has 12,039 and 12,173 total population respectively and has an average growth rate of 0.21%.

The municipality of Perez is located at 15 km. from the municipality of Alabat and 12 nautical miles from the municipality of Atimonan. It is bounded on the north by Pacific Ocean, on the south by Lamon Bay, on the east by the municipality of Alabat and on the west by Pacific Ocean.

Its geographical coordinates are latitude 14°11’00’’ north and longitude 121°57’00’’ east.

TOPOGRAPHY

Perez is a coastal town with prominent hills and upland areas covering Barangays Pambuhan, Mainit Norte, and Sangirin. It has irregular coastlines with rugged surfaces and beaches.
Inland water bodies consist of rivers, creeks, and springs. Most notable are Sangirin river, Mainit River, Pinagtubigan Weste River, Pinagsibangan River, Caguisi River and Mayanti Creek.

SLOPE

Slope ranges from 0-3% to 15% and above. A land area has 3-8% slope. These constitute about 57% of the total land area. These are barangays of Villa Manzano Sur, Rizal, Maabot, pinagtubigan Este, and Pinagtubigan Weste. Highest elevated areas only have a slope of 15% and above. These are barangays of Pambuhan, Mainit Norte, Sangirin, and portions of Pinagtubigan Este and Villa Mnzano Norte.

SOIL TYPE

As per report by the Bureau of soils for the Province of Quezon, the soil of Perez is of three types, the San Miguel Sandy Loam, Beach Sand, and Bolinao Clay Loam which is prominent in the area.

The poblacion consist of four (4) urban barangays and considered as a minor business district. The municipal hall, the commercial establishments mostly Sari-sari Store. The public market, the Church and the Plaza, makes it the center of all transaction activities in the municipality.