Neiva's 2021 population is now estimated at 359,214. In 1950, the population of Neiva was 31,306. Neiva has grown by 1,999 since 2015, which represents a 0.56% 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 Neiva, which typically includes Neiva's population in addition to adjacent suburban areas.