León is the most populous city and municipal seat of the municipality of León in the Mexican state of Guanajuato. It is the fourth-most populous municipality in Mexico. The metropolitan area of León is the seventh most populous metropolitan area in Mexico. León is part of the macroregion of Bajío within the Central Mexican Plateau.
León has a strong leather industry, offering shoes, boots, belts, jackets, and other leather accessories to national and international markets. The leather industry earned its inhabitants the nickname of "green belly" (panzaverde in Spanish) because of the green tainting in the workers' bodies resulting from treating leather. Its first-class services and hotel industry make it an important commercial centre in Mexico with numerous options for entertainment, gastronomy, leisure activities, arts, and recreation. It is also considered one of the most environmentally friendly cities in Mexico and has a high number of cyclists, in part because of integrating a network of bike lanes into the SIT system. In March 2012, it received an award as "City Water Champion", mainly due to great progress in the areas of sanitation, wastewater reuse, and energy generation from bio-gas. The Del Bajío International Airport (Guanajuato International Airport) serves the city, although it is located in the neighbouring city of Silao. The city has also developed important economic activity in the automotive industry.
León has a population of over 1,721,626 people. León also forms part of the wider León metropolitan area which has a population of over 2,140,094 people.
León is twinned with: Bogotá, Colombia • Cangas de Onís, Spain • Havana, Cuba • Irving, United States • Laredo, United States • Las Vegas, United States • León, Nicaragua • León, Spain • Novo Hamburgo, Brazil • San Diego, United States • Suzhou, China • Fermo, Italy.