Total population increased by 38,932 persons
The province of Ilocos Sur had a total population of 633,138 persons as of August 1, 2007, an increase of 38,932 persons from 594,206 persons reported in 2000. This increase translated to an annual population growth rate (PGR) of 0.88 percent during the period 2000 to 2007, or a decline of 0.97 percentage point from the PGR of 1.85 percent reported during the period 1995 to 2000.