No. 4: Walgreens, with 2009 sales of $63.3 billion and 7,397 stores
July 1, 2010
Pharmacist Seema Verma, left, rings up a prescription and some other items for Linda Freund at a Walgreen's store in downtown Chicago, Monday, March 28, 2005. Walgreen Co., the top U.S. drugstore chain, said second-quarter earnings rose 14 percent on increased pharmacy sales. Photographer: Brian Kersey/Bloomberg News.
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