15 of the Biggest Employers in America

Twenty years ago, the Fortune 500's top 10 companies included several automakers, two oil companies, a tobacco company, Enron -- a company then on the verge of bankruptcy -- and Walmart. Flash forward to the latest Fortune 500, and Walmart is still on the list, as is IBM.

Companies are typically ranked according to their annual revenue or perhaps their market capitalization, but it's also instructive to see which companies are the largest in terms of employees -- after all, they're putting money into the pockets of many millions of Americans, keeping our economy going. Here's a look at 15 of the biggest employers in the Fortune 500.

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