León (Spanish pronunciation: [leˈon]), officially León de Los Aldama (English: Lion of the Aldama), is the most populous city and municipal seat of the municipality of León in the Mexican state of Guanajuato. In the 2020 Intercensal Survey, INEGI reported 1,721,626 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 2,140,094 in the 2020 state 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 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.