The number of non-heterosexual Americans has doubled in the past decade.
In a Gallup survey, more than 7 percent of adults surveyed said they were bisexual, gay, transgender or otherwise queer.
In 2012, only 3.5 percent of respondents had identified a gender identity other than heterosexuality.
According to the study published on Thursday, Generation Z Americans were particularly likely to belong to the LGBTQ community.
More than 20 percent of Americans aged 18 to 25 said they were not traditionally heterosexual.
Among those surveyed aged 26 to 41, it was around ten percent.
In the baby boomer group, aged 58 to 76, almost three percent identified as gay, lesbian,
Overall, nearly two in three non-heterosexual Americans said they were attracted to both men and women.
Bisexuals make up the largest group in the American LGBTQ community.
Gallup attributes the fact that the proportion of non-heterosexual Americans in Generation Z is increasing particularly sharply to the increasing acceptance of different gender identities and sexual orientations.
While only 45 percent of Americans supported same-sex marriage in 2011, about 70 percent now support gay marriage.