 Following the splitting of the Regency to create a new Meranti Islands Regency, the residual area of Bengkalis Regency had a population of 498,336 at the 2010 Census and 543,987 at the 2015 Census.The eight districts ("kecamatan") currently forming the Regency are listed below with their areas and populations at the 2010 and 2015 Censuses