The Mexican Post was invited to join the Universal Postal Union in 1878, and on April 1, 1879, it did so. The First Postal Code and Rules go into effect on January 1, 1884, and are eventually replaced by the Second Postal Code in 1895. Our extensive coverage encompasses 98 percent of the Mexican Republic, with 29,000 service locations, over 2800 land routes, and over 15,000 quality service collaborators, all of which contribute to their position as one of Mexico's most important distribution services.