Exactly 0.3 percent of Americans are transgender, according to a 2011 report from the Williams Institute.

[dcquiz] That study pegged the number of transgenders in America at around 700,000 people. Or, to put it differently: 99.7 percent of Americans aren’t transgender.

And 0.3 percent might actually be too high of a number. The Williams Institute’s researchers arrived at the commonly-cited 0.3 percent figure by averaging the results of two studies — one in Massachusetts and one in California.

The Massachusetts study found that 0.5 percent of the population was transgender, while the California study found that transgenders made up just 0.1 percent of the population. That is: the California study found only one in 1000 Californians to be transgender.

A 2009 study in the United Kingdom found similar results. That study found that only 0.1 percent of the UK population was transgender.

The UK researchers used a slightly narrower definition of transgender, referring only to people who actually underwent the process of “transitioning” from one gender to the other.

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