The Encyclopedia of Associations is a comprehensive source of detailed information on over 135,000 nonprofit membership organizations in the United States. It corresponds to the printed Encyclopedia of Associations family of publications. National Organizations of the U.S. (45th ed., 2008) covers more than 22,200 American associations of national scope. Regional, State, and Local Organizations (18th ed., 2007) covers more than 115,000 U.S. associations with interstate, state, intrastate, city, or local scope or membership. The Encyclopedia of Associations database provides addresses and descriptions of professional societies, trade associations, labor unions, cultural and religious organizations, support groups, fan clubs, and other groups of all types.