Associations Unlimited combines data from the entire Encyclopedia of Associations series and includes additional IRS information on nonprofit organizations, for a total of more than 456,000 organizations worldwide: International and U.S. National, Regional, State, and Local. It covers everything from local Chambers of Commerce to the American Medical Association, and beyond. Note: In January 1998, the name was changed from Encyclopedia of Associations to Associations Unlimited. Current edition. Updates: Continuous.