San Fernando is a town and municipality in the Mexican state of Chiapas in southern Mexico. As of 2020, the municipality had a total population of 41,793, up from 26,436 as of 2005. It covers an area of 258.3 km2. As of 2010, the town of San Fernando had a population of 9,651. Other than the town of San Fernando, the municipality had 196 localities, the largest of which (with 2010 populations in parentheses) were: El Progreso (2,704), El Copalar (2,039), Francisco I. Madero (1,993), Gabriel Esquinca (1,968), Benito Juárez (1,488), Viva Cárdenas (1,431), Álvaro Obregón (1,126), and 16 de Septiembre (1,020), classified as rural.