Okayama's 2021 population is now estimated at 724,157. In 1950, the population of Okayama was 123,666. Okayama has grown by -539 since 2015, which represents a -0.07% 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 Okayama, which typically includes Okayama's population in addition to adjacent suburban areas.