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2. Dunkin' Donuts

Stores: 6,900
2010 Sales: $5.62 billion

It's hard to pinpoint the exact moment Dunkin' Brands became a major player in the coffee retail industry, but the company's own brand of coffee hit grocery store shelves in 2007.

Known primarily for its doughnuts since its founding in Quincy, Mass., in 1950, the chain now claims to sell more coffee by the cup than any other retailer out there. It added 400 stores in 2010.