Porongos was founded on 18 July 1805 by General José Gervasio Artigas, the Uruguayan independence leader. It had acquired the status of "Pueblo" (village) before the Independence of Uruguay. It reached the status of "Villa" (town) under the name "Villa de Porongos". It was renamed to "Villa de la Santísima Trinidad" (Most Holy Trinity) and became capital of the newly created Department of Flores on 30 December 1885 by the Act of Ley Nº 1.854. Its naming reflects a less secular period in the country's history.