The league

The league currently consists of thirty-two teams from the United States. The league is divided evenly into two conferences—the American Football Conference (AFC) and National Football Conference (NFC), and each conference has four divisions that have four teams each, for a total of 16 teams in each conference. The NFL is an unincorporated 501(c)(6) association, a federal nonprofit designation, comprising its 32 teams.

Source : Wikipedia