San Juan Chamelco's 2026 population is now estimated at 15,570. In 1994, the population of San Juan Chamelco was 4,882. San Juan Chamelco has grown by 309 in the last year, which represents a 2.02% annual change. These population values and projections come from CityPopulation Guatemala cities and towns census series (1994, 2002) fallback access, INE Guatemala Censo 2018 A1.2 municipio urban population and World Population Review Internal Projections .