As of 2010, the municipality had a total population of 38,143,[1] up from 32,457 as of 2005.[2] It covered an area of 685.6 km2 (265 sq mi).
The area and population of the municipality have since been reduced, after the western portions of its territory were split off to form the municipalities of Capitán Luis Ángel Vidal in 2017[3] and Honduras de la Sierra in 2019.[4]
As of 2010, the town of Siltepec had a population of 3,400.[1] Other than the town of Siltepec, the municipality had 201 localities, the largest of which (with 2010 populations in parentheses) were: Libertad Ventanas (1,283), El Palmar Grande (1,127), and Vega del Rosario (1,014), classified as rural.[1]
^"Siltepec". Enciclopedia de los Municipios de México. Instituto Nacional para el Federalismo y el Desarrollo Municipal Gobierno del Estado de Chiapas. Archived from the original on September 30, 2007. Retrieved August 1, 2008.
^"Decreto Número 248"(PDF). Periódico Oficial del Estado de Chiapas, Segunda Sección (in Spanish). 6 September 2017. Retrieved 25 October 2020.
^"Decreto Número 248"(PDF). Periódico Oficial del Estado de Chiapas (in Spanish). 11 September 2019. Retrieved 24 October 2020.