Mannheim's 2023 population is now estimated at 343,333. In 1950, the population of Mannheim was 246,300. Mannheim has grown by 3,160 in the last year, which represents a 0.93% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Mannheim, which typically includes Mannheim's population in addition to adjacent suburban areas.