The adoption of the Cadiz Constitution in Spanish controlled lands was formally recognized in Jocotitlán on 7 July 1820. However, this constitution required the naming of municipal authorities although there was yet no municipality. This was rectified on 19 July, with the formation of an ayuntamiento or municipal council and the marking of territory which contained 1,000 people. The municipality was created by joining the haciendas of Tiacaque, Villeje, Pasteje, Nenanci and Caro. The towns and villages at that time were mostly communities of laborers on these haciendas. The first municipal president was C. Antonio del Valle. In 1823, some of its territory, called Tapaxco, was separated from the municipality. The State of Mexico ratified the establishment of the municipality in 1825.