Chalchihuitán is a town and municipality in the Mexican state of Chiapas, in southern Mexico. It covers an area of 74.5 km². In 2020, the municipality had a total population of 21,915, up from 12,256 in 2005. In 2010, the town of Chalchihuitán had a population of 1,054. Other than the town of Chalchihuitán, the municipality had 45 localities, the largest of which (with 2010 populations in parentheses) were: Chiquinshulum (1,612), classified as urban, and Joltealal (1,004), classified as rural.