What Percentage of Americans Have a PhD?

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According to U.S. Census 2013 data, 1.68 percent of Americans over the age of 25 have a PhD. This equates to approximately 2.5 million people. People with professional degrees such as MD or DDS make up 1.48 percent of the U.S. population, making the total percent of Americans referred to as doctors equal to 3.16 percent.

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