For the head town of this municipality see «Bácum». The Municipality of Bácum is one of the 72 municipalities that constitute the Mexican state of Sonora. It is located on the Yaqui Valley in the south of the state. It has 194 localities within its territory, its municipal seat is the town of Bácum, one of the original towns of the Yaqui tribe, and its most populated is the Francisco Javier Mina police station, while other important towns are San José and First of May. It was decreed as an independent municipality on May 13,1931, after being separated from that of Cajeme.
According to the intercensal survey of 2015 conducted by INEGI, the municipality has a total population of 23,053 inhabitants and occupies an area of 1578.16 km². Its Gross Domestic Product per capita is USD 6,617, and its human development index is 0.7882. Like most of the municipalities of Sonora, the name was given by its municipal head.