The province was created with the municipalities of Jimaní, Duvergé and La Descubierta with Jimaní as capital of the province. Postrer Río became a municipality in 1982, Cristóbal in 2003 and Mella in 2004. Guayabal was made a municipal district in 1998, El Limón in 2001, La Colonia in 2004, Boca de Cachón and Vengan a Ver in 2005, and Batey 8 in 2006.