Blida's 2025 population is now estimated at 535,641. In 1950, the population of Blida was 33,970. Blida has grown by 11,722 in the last year, which represents a 2.24% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects . These estimates represent the Urban agglomeration of Blida, which typically includes Blida's population in addition to adjacent suburban areas.