In 1982, Maimón became a municipality and in 1991 Piedra Blanca became the third municipality of the province. Villa Sonador became a municipal district in 1999, Sabana del Puerto in 2000, Juan Adrián in 2001, Juma Bejucal in 2004, and Arroyo Toro-Masipedro and Jayaco in 2006.