Based on the 2015 Census of Population and Housing (CPH), the province of Sorsogon posted a total population of 792,949 persons as of August 1, 2015. This is larger by 52,206 persons compared to its total population of 740,743 persons counted in the 2010 CPH.
The increase in the population count from 2010 to 2015 translated to an average annual population growth rate (PGR) of 1.30 percent. This is lower than the 1.31 percent annual PGR of the province between the census years 2000 and 2010 and the 2.21 percent between 1990 and 2000. This means that there were about 13 persons added per year for every 1,000 persons in the population.
Among the lone city and 14 municipalities comprising the province of Sorsogon, the City of Sorsogon, the provincial capital, was the most populous with a population size making up 21.2 percent of the total provincial population. The municipality of Bulan was second with 12.6 percent share, followed by the municipalities of Pilar with 9.4 percent, Gubat with 7.5 percent, and Castilla with 7.3 percent.
The least populated area was the municipality of Santa Magdalena with 2.1 percent share to the total population of the province. It was also the least populated area in 2010.
Of the 790,314 household populations in 2015, males accounted for 50.9 percent while females comprised 49.1 percent. These figures resulted in a sex ratio of 104 males for every 100 females. The sex ratio recorded in 2010 was also 104 males per 100 females.