Baja California Sur is a state in Northwest Mexico divided into five municipalities. According to the 2020 Mexican census, Baja California Sur is the second least populous state with 798,447 inhabitants and the 11th largest by land area, spanning 73,909.4 square kilometres (28,536.6 sq mi).

Municipalities are the second-level administrative divisions of Mexico, where the first-level administrative division is the state. They should not be confused with cities or towns that may share the same name as they are distinct entities and do not share geographical boundaries. As of March 2024, there are 2,476 municipalities in Mexico, excluding the 16 boroughs of Mexico City.