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 history
The 1990s saw the establishment of Transgender Day of Remembrance to honor those lost to violence, transgender marches and parades around the time of Gay Pride celebrations and increasingly in the 2000s and after, the visibility of transgender individuals rose, along with actresses like Laverne Cox who was on the cover of TIME and exemplified by Caitlyn Jenner coming out in 2015. Many news sources have described Jenner as the most famous openly transgender American.
Organizations such as the Girl Scouts and the Episcopal Church announced acceptance of transgender people in the 2010s. 
In 2016, the Obama administration issued guidance that clarified Title IX protections for transgender students. This letter included definitions of terminology and clarified the rights of transgender students, the most well-known being allowance of transgender students to use bathrooms and locker rooms matching their gender identity. However, some legislative bodies took up bills seen as discriminatory, such as North Carolina's HB 2. The Obama administration's guidance for protection of transgender students was rescinded in early 2017 by the Trump administration.