Poznan's 2025 population is now estimated at 518,274. In 1950, the population of Poznan was 315,618. Poznan experienced a decrease of -2,500 residents over the past year, marking an annual decline of -0.48%.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Poznan, which typically includes Poznan's population in addition to adjacent suburban areas.