In 1950, by decree of the state congress, the city received the title of Heroica Puebla de Zaragoza.
Od 1931 do konca 20. stoletja je rast mesta spodbudila absorpcijo občin Ignacio Mariscal, San Felipe Hueyotlipan, Resurreccion, San Jeronimo Caleras, San Miguel Canoa in San Francisco Totimehuacán.