Rio Abajo's 2026 population is now estimated at 28,388. In 2000, the population of Rio Abajo was 28,714. Rio Abajo has grown by 115 in the last year, which represents a 0.41% annual change. These population values and projections come from Panama census 2000 nomenclature places, Panama census 2010 nomenclature places, Panama census 2023 Cuadro 3 place population and World Population Review Internal Projections .