"[2] Agriculture is still the main economic activity, but the development of a number of industrial parks, such as Atlacomulco 2000, which allowed the seat to reach city statues by 1987.

This area eventually came under the control of Azcapotzalco during the reign of Tezozomoc, calling it the province of Mazahuacan.

After the Spanish conquest of the Aztec Empire, Atlacomulco became the encomendero of Francisco de Villegas in 1535.

The only events of note were the passing of the armies of Miguel Hidalgo and Ignacio López Rayón on the edges of the municipality during the Mexican War of Independence.

[1] In 1915, during the Mexican Revolution, Lucio Blanco occupied the city of Atlacomulco with his groups while on his way to the Bajío region.

He is known here for sacking almost all of the municipality's grain, as well as printing money which was circulated in the north of Mexico.

During this time period, the municipality's most famous resident, Isidro Fabela Alfaro was active as a politician and writer.

It is part of the Lerma River basin which crosses the territory, as well as a number of streams and fresh-water springs.

The northern part of the municipality near the Jocotitlán volcano is now a natural reserve where logging is prohibited and reforestation is underway.

In the middle of the lake created by the dam is the Isla de las Aves or Island of the Birds.