Rio Bravo is a municipality that is located in the Rio Grande Valley, north of the state of Tamaulipas, Mexico. It borders to the north with the United States. To the south with the municipalities of Méndez and San Fernando. To the East, with the municipalities of Matamoros and Valle Hermoso and, to the West, with the municipality of Reynosa. Its head is the city of Rio Bravo. The latest data released by the INEGI in the Intercensal Survey 2015 shows a municipal population of 126,887. CONAPO had planned a population of 129,919, whose population may be the current one due to the multiple difficulties that arise at the moment of surveying.