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 ().
Transgender personnel in the United States military
Also in May 2014, the Williams Institute published a research brief estimating 15,500 transgender people were serving on active duty or in the Guard/Reserves, and an additional 134,300 transgender people were either veterans or retired from the Guard/Reserves. The brief was based on a six-month survey of over 6,000 transgender people in 2008–09 asking (in part) if they had ever served in the armed forces, or had been denied entry because they were transgender.