The city of León, formally León de los Aldama is the fifth most populous city in Mexico and the first in the state of Guanajuato. It is also the seat of the municipality of León. It has a strong leather industry, offering shoes, boots, belts, jackets, and other leather accessories both to national and international markets.
In the 2005 census the National Institute of Statistics, Geography and Data Processing (INEGI) reported 1.137.465 people living in the city of León, 1.278.087 in the municipality of León, and 1.634.917 in the metropolitan area, which includes the neighbouring municipality of Silao, Purísima del Rincón and San Francisco del Rincón. The municipality of León, which has an area of 1,219.67 km² (490.92 sq mi), also includes numerous smaller outlying communities, the largest of which are Centro Familiar la Soledad, Medina, and La Ermita.
There is a large Argentinian immigrant community in the city, as well as one formed by descendants of Lebanese immigrants.
León was inhabited in pre-Hispanic times by diverse native groups, such as the Toltecs, Chichimecas, Guamares, among others. The archaeological sites of Alfaro and Ibarrilla, close to the city of León, reveal that the oldest settlements of this zone date from Preclassical times.
The city of León was founded January 20, 1576 with the name Villa de Leon, by the order of the Virrey Don Martín Enríquez de Almaza, for the purpose of creating a defense against the attacks of the Chichimecas. In 1580 it was elevated to the category of Alcaldía Mayor, separating it from Guanajuato and had jurisdiction in the present municipality of León.
In June 1830 it was elevated to the rank of city with the official name: León de los Aldama. During the Mexican War of Independence, it suffered in the political, social, and economic areas. Because many people abandoned the mines of Guanajuato because of the war, many workers were re-established themselves in León. Agriculture was the main economic activity to the 18th century, until the craft and the production of footwear began to compete with it.
The post-revolution years were, for León, ones of prosperity and material progress, as well as of population growth. The economic development resulted in extraordinary agricultural and industrial growth and the wealth of 1923.
The city had once another two Soccer teams, which also played in the Primera División de México: San Sebastián, which participated in the league in the early 1950s – and was the first team in Mexico to get relegated to the Segunda División – and Unión de Curtidores, that disappeared in the middle 1980s.
A new franchise with the name of Curtidores appeared in the Primera División A in the mid-1990s, but, after being champion in 1999 and earning the right to play in the Primera División, was sold and moved to Puebla to become Puebla, F.C., but in 2007 a new franchise named Union de Curtidores began playing at Segunda división.
Nowadays, there are several soccer teams in the city playing in the Tercera División: Atlético ECCA, Juventud Cuerera and Conmudaj, among some others along with the women's league, Super Liga Femenil de Futbol.