Mykolaiv's 2026 population is now estimated at 474,969. In 1950, the population of Mykolaiv was 168,314. Mykolaiv experienced a decrease of -1,445 residents over the past year, marking an annual decline of -0.3%. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects . These estimates represent the Urban agglomeration of Mykolaiv, which typically includes Mykolaiv's population in addition to adjacent suburban areas.