Nearly 1 in 10 adults in the United States identifies as LGBTQ+, according to a large analysis from Gallup released Thursday — almost triple the share since Gallup began counting in 2012, and up by two-thirds since 2020.

The increases have been driven by young people and bisexual women.

Nearly one-quarter of adults in Generation Z, defined by Gallup as those 18 to 27, identify as LGBTQ+, according to the analysis, which included 14,000 adults across all of Gallup’s telephone surveys last year. More than half of these LGBTQ+ young adults identify as bisexual.

Among all respondents, 1.3% identified as transgender, up from 0.6% in 2020. That is higher than other large surveys have found in recent years.

Members of Gen Z were most likely to be transgender, Gallup found — 4.1% were, compared with 1.7% of millennials and less than 1% in each older generation. Various groups have tried to count this population, and Gallup’s survey is considered one of the most complete.

Respondents were asked if they considered themselves straight or heterosexual, lesbian, gay, bisexual or transgender, and could choose more than one identity or volunteer another. About 86% of respondents said they were straight, according to Gallup.

President Donald Trump’s administration has recently reversed a variety of initiatives aimed at supporting LGBTQ+ people, particularly those who are transgender.

Based on an executive order declaring that there are only two sexes and that they cannot be changed, the Trump administration has threatened to end federal funding for hospitals that provide gender-transition health care to people younger than 19; ban transgender girls and women from competing on female sports teams; and ban transgender people from serving in the military.

The president has announced plans to revoke federal funding from schools that teach about “gender ideology,” and dismantled a policy protecting transgender students from discrimination. Government agencies have removed resources related to terms like LGBTQ+ and gender from their websites. (Some have been restored under a court order.)

Increasing LGBTQ+ identification has been “largely driven by the many decades of gradual increasing societal acceptance,” said Dr. Mitchell Lunn, who co-directs the Pride Study, a research project at Stanford University on the health of LGBTQ+ people. Now, he said, “I think we may lose a lot of the really positive momentum that we’ve built over the past decades.”

Lunn said he thinks the Gallup numbers are probably an underestimate, mostly because people might not feel comfortable sharing the information in a telephone survey. (Five percent of respondents declined to answer Gallup’s question.) He said he wouldn’t be surprised if the numbers declined next year, if social acceptance decreases under the Trump administration.

“I worry that it will push some people to go back into the closet and not be out about their identity anymore,” Lunn said.

In the surveys, there were large differences in LGBTQ+ identification by political ideology. Twenty-one percent of liberals identified this way, compared with 3% of conservatives. There were also significant gender differences: Women were almost twice as likely as men to identify as LGBTQ+. In Gen Z, 31% did, compared with 12% of men.

Though LGBTQ+ identification has increased in recent years for all but the oldest generations, it has grown fastest among young people. An average of 23% of Gen Z adults have identified this way over the past two years, up from 19% from 2020 to 2022. Most of them identify as bisexual.

Young people have come of age during a period of unusually rapid social change in this area since the 2010s. It has been driven by the nationwide legalization of same-sex marriage in 2015 and by pop culture and social media.

It’s now common for middle and high schools to have LGBTQ+ affinity groups, which researchers have said are important for adolescent mental health at a time when they are exploring their identity. Schools have been especially welcoming in the West and Northeast, according to GLSEN, a nonprofit that researches LGBTQ+ students.

Yet even as acceptance has been growing, so has stigma.

Many states, particularly ones led by Republicans, have proposed or enacted restrictions aimed at LGBTQ+ young people in recent years, particularly young transgender people. This has likely contributed to the poor mental health of young people who are gay or transgender, researchers said.