Teresina's 2021 population is now estimated at 1,031,220. In 1950, the population of Teresina was 54,178. Teresina has grown by 9,991 since 2015, which represents a 0.98% 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 Teresina, which typically includes Teresina's population in addition to adjacent suburban areas.