Tequixquiac is one of the 125 municipalities of the State of Mexico and one of the 7 municipalities that make up the Zumpango Region, is located northeast of the city of Toluca de Lerdo, capital of the state and north of Mexico City, capital of the country, in the direction of the State of Hidalgo, being a place of transition between the Valley of Mexico and the Valley of the Mezquital, its municipal seat is the town of Tequixquiac or Santiago Tequixquiac.
The Municipality of Tequixquiac limits to the north with the municipality of Apaxco, to the south with the municipality of Zumpango, to the southwest with the municipality of Huehuetoca, to the east with the municipality of Hueypoxtla and to the west with the municipality of Atotonilco de Tula, is last within of the state of Hidalgo. This municipality is one of the oldest in the state of Mexico and was founded as such in the year 1820 under a decree of the Constitution of Cádiz, at the same time that the independence movement of New Spain was carried out, it was segregated from the Administration of San Juan Zitlaltepec, which was also annexed the town of Tlapanaloya and Apaxco, which belonged to the Hueypoxtla administration. The lands of old colonial haciendas and rancherías that were owned by descendants of Spaniards and Tlaxcaltecas were integrated into the municipality.
In the municipality we have found the Sacred Bone of Tequixquiac, one of the first artistic pieces in America, which was found during the excavations of the Tequixquiac Tunnel as well as some bones of prehistoric animals of great size. The municipality is also famous for the mouth of the Great drainage channel of Mexico City, a civil engineering work that in its time was compared with the major sanitation works of European cities. Another interesting fact is the agrarian movements that have arisen in this place and that has served as an example in the defense of ejidal and communal land in the 20th century.