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.