Iasi's 2025 population is now estimated at 316,343. In 1950, the population of Iasi was 94,156. Iasi experienced a decrease of -193 residents over the past year, marking an annual decline of -0.06%.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Iasi, which typically includes Iasi's population in addition to adjacent suburban areas.