Río Bravo is a town, with a population of 15,391, and a municipality in the Suchitepéquez department of Guatemala. Rio Bravo is a municipalit…Río Bravo is a town, with a population of 15,391, and a municipality in the Suchitepéquez department of Guatemala. Rio Bravo is a municipality that belongs to the department of Suchitepequez, in the Republic of Guatemala. The town was established December 10, 1951.