America’s Highest-Grossing Fast-Food Chains Slideshow

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#1 McDonald’s; Oak Brook, Ill.: $32.4 billion

Number of U.S. locations: 14,000

Chicken McNuggets and Big Macs will always be synonymous with McDonald’s, but the mega-chain has aggressively targeted a more health-minded crowd in recent years with menu items like market-fresh salads and fruit smoothies — not to mention an overhaul of their kids meals. Good news for fans of the seasonal Shamrock Shake: For the first time in the brand’s history the green-hued vanilla confection is available in all locations nationwide throughout March.