Onitsha's 2021 population is now estimated at 1,482,971. In 1950, the population of Onitsha was 74,437. Onitsha has grown by 68,181 since 2015, which represents a 4.82% 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 Onitsha, which typically includes Onitsha's population in addition to adjacent suburban areas.