Santiago Tianguistenco, often simply called Santiago by locals, is a city located in Mexico State about thirty km south of the state capital of Toluca. It is the municipal seat for the municipality of Tianguistenco. It is located in the southwest part of the Valley of Toluca at the edge of the Ajusco mountain range that separates it from Mexico City. The name Tianguistenco (Tyanguistengko) is from Nahuatl and means “at the edge of the tianguis,” which is a traditional Aztec market. The section of the city where the industrial park is still bears this name. Historically, the area was known as having one of the richest and best-stocked markets in the Toluca Valley. Today, it is still home to a large permanent municipal market as well as a weekly tianguis that covers much of the historic center.

The State of Mexico, officially just Mexico, is one of the 32 federal entities of the United Mexican States. Commonly known as Edomex to distinguish it from the name of the whole country, it is the most populous, as well as the most densely populated, state in the country.