The creation of the municipality of Calintaan was first introduced though an Act of Congress, under the House Bill No. 1133 on 18 June 1966. The municipality of Calintaan was finally created through Republic Act No. 4732 which was signed into law by then President Ferdinand Marcos. The late Congressman Pedro O. Medalla, worked hard and gave all his best efforts for the passage of the bill.
    Calintaan is one of eleven (11) municipalities of the province of Occidental Mindoro. The municipality is adjacent the China Sea, and situated between the municipalities of Sablayan and Rizal. Calintaan was formerly a part of the municipality of Sablayan.
     According to reliable sources, the name of the municipality was once San Miguel derived from its patron saint. When the third immigrants from Panay Island arrived in the municipality they discovered the fresh water worm known in English term as Leech. It is commonly called by the Visayans as Linta. When asked by their friends, when they returned to Panay Island, as to where they had been – the response was “from the barrio of Calintaan”. The municipality, thus, retained the name.
     The municipality of Calintaan is composed of seven (7) barangays, namely: Poblacion, Iriron, Concepcion, Malpalon, Poypoy, New Dagupan, and Tanyag. The natural resources and assets of these barangays remain undeveloped and untapped. Barangays Poblacion, Concepcion and Iriron are coastal barangays, whereas, Barangays Poypoy, Tanyag, New Dagupan and Malpalon are inland barangays with wide agricultural and forest lands.
      Agricultural land production is rather high due to the numerous rivers that provides more than enough water for irrigation purposes. The four (4) major rivers that traverses Calintaan includes Lumintao, Anahawin, Patay-Ilog and Nagapi rivers.