Monte San Juan's 2026 population is now estimated at 13,455. In 2007, the population of Monte San Juan was 10,224. Monte San Juan has grown by 85 in the last year, which represents a 0.64% annual change. 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 .