Celaya's 2021 population is now estimated at 689,735. In 1950, the population of Celaya was 34,553. Celaya has grown by 8,764 since 2015, which represents a 1.29% 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 Celaya, which typically includes Celaya's population in addition to adjacent suburban areas.