León (Spanish pronunciation: [leˈon]) is the most populous city and municipality in the Mexican state of Guanajuato. In the 2015 Intercensal Survey INEGI reported 1,578,626 people living in the municipality of León, making it the fourth most populous municipality in Mexico. The metropolitan area of León recorded a population of 1,630,094 in the 2010 Census, making it 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 both to national and international markets. Its first-class services and hotel industry make it one of the most important centers in Mexico with numerous opportunities 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 the integration 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 and wastewater reuse and energy cogeneration from biogas.