Mariupol's 2026 population is now estimated at 423,423. In 1950, the population of Mariupol was 191,219. Mariupol experienced a decrease of -2,500 residents over the past year, marking an annual decline of -0.59%. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects . These estimates represent the Urban agglomeration of Mariupol, which typically includes Mariupol's population in addition to adjacent suburban areas.