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by Allen J. Sheinman | September 03, 2010
The list

 
Teachers: 7.2 million
Registered nurses: 2.8 million
Janitors and building cleaners: 2.1 million
Computer software engineers: 1 million
Hairdressers, hairstylists and cosmetologists: 773,000
Farmers and ranchers: 751,000
Clergy: 441,000
Chefs and head cooks: 351,000
Roofers: 234,000
Gaming services workers: 111,000
Tax preparers: 105,000
Meeting and convention planners: 56,600

Source: U.S. Bureau of Labor Statistics

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