Since the early 2000s, there has been a boundary dispute between San Antonino and Ocotlán de Morelos. At that time, Ocotlán sold an area called “Barratillo de Ocotlán” to San Antonino, but the exact boundaries of the land sold have been in dispute ever since. In 2003, there was a confrontation between the two municipalities over that area, but a more significant one occurred in 2009. The confrontation was sparked by the placement of a sign on Federal Highway 175 by the Secretariat of Communication and Transportation and the municipality of San Antonino to indicate the latter's existence to travelers. However, Ocotlán claims the land on which the sign was being erected. The confrontation resulted in injuries to both parties and the use of tear gas by the state police to break it up.
