Since 1784, Alamos became episcopal seat of Sonora’s bishop. It’s first bishop was Friar Antonio de los Reyes. The temple’s construction began on 1786 and was finished in the first decade of the XIX century.

By decree, on February 23rd, 1828, Alamos became provincial capital of the state of Occidente, which included Sonora and Sinaloa, adopting before the category of city on January 19th, 1828 and by then the name of Concepcion de Alamos. On that same year, the first press was installed, and the first newspaper to be in circulation on the state of Occidente was published.

In addition, a Currency House was established in order to mint coins. The installation was in charge of Don Leonardo Santoyo.

The city was scene of numerous battles, standing out the fought on January 7th, 1866, in where republican general Angel Martinez defeated the imperialist forces commanded by Don José Tranquilino Chato Almada and that occupied the parade ground.