Transgender
One effort to quantify the population gave a "rough estimate" that 0.3 percent of adults in the US are transgender, overlapping to an unknown degree with the estimated 3.5 percent of US adults (1-in-30) who identify as LGBT. More recent studies released in 2016 estimate the proportion of Americans who identify as transgender at 0.5 to 0.6%. This would put the total number of transgender Americans at approximately 1.4 million adults ().
History of transgender people in the United States
Virginia Prince, a transgender person who began living full-time as a woman in San Francisco in the 1940s, developed a widespread correspondence network with transgender people throughout Europe and the United States by the 1950s. She worked closely with Alfred Kinsey to bring the needs of transgender people to the attention of social scientists and sex reformers.