The Blue Cross Blue Shield Association is a federation of 39 separate health insurance organizations and companies in the United States. Combined, they directly or indirectly provide health insurance to over 100 million Americans. The history of Blue Cross dates back to 1929, while the history of Blue Shield dates to 1939. The Blue Cross Association dates back to 1960, while its Blue Shield counterpart was actually created in 1948. The two organizations merged in 1982, forming the current association. The company has its headquarters in the Michigan Plaza complex in the Chicago Loop area of Chicago, Illinois.