Smolensk's 2025 population is now estimated at 326,841. In 1950, the population of Smolensk was 111,288. Smolensk experienced a decrease of -137 residents over the past year, marking an annual decline of -0.04%.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Smolensk, which typically includes Smolensk's population in addition to adjacent suburban areas.