San Carlos's 2026 population is now estimated at 5,012. In 2007, the population of San Carlos was 4,172. San Carlos has grown by 34 in the last year, which represents a 0.68% 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 .