The National League of Cities (NLC) is an advocacy organization in the United States that represents the country's 19,495 cities, towns, and villages along with 49 state municipal leagues. Created in 1924, it has evolved into a leading membership organization providing education, research, support, and advocacy to city leaders across America. Based in Washington, D.C., it is considered part of the 'Big Seven', a group of organizations that represent local and state government in the United States. The NLC provides training to municipal officials, holds conferences, lobbies and provides assistance to cities in educational issues.