Usulutan's 2026 population is now estimated at 70,725. In 2007, the population of Usulutan was 73,064. Usulutan experienced a decrease of -30 residents over the past year, marking an annual decline of -0.04%. These population values and projections come from DIGESTYC Censo de Poblacion y Vivienda 2007 poblacion por municipio and ONEC-DIGESTYC proyecciones municipales de poblacion 2020-2030 revision 2021 .