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3. United States Postal Service
2007 revenue: $74.8 billion
Fiscal year end: Sept. 30
2007 Employees: 786,000
Industry: Mail, package, freight delivery
CEO: John E. Potter
Location: Washington, D.C.

It's the mail. A self-supporting federal agency, the USPS moves more than more than 212 billion letters, cards, ads, bills, payments and packages every year.

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Last updated May 28 2008: 12:40 PM ET