Gallup's latest update on lesbian, gay, bisexual or transgender identification finds 5.6% of U.S. adults, estimated to be up to 18 million, identifying as LGBT. 

The current estimate is up from 4.5% in Gallup's previous update based on 2017 data.

In 2020, 5.6% of U.S. adults identified as LGBT. That is up from 4.5% in 2017, the last year it was asked, and 4.1% in 2016. Between 2012 and 2015, 3.5% to 3.9% of U.S. adults identified as LGBT.

Currently, 86.7% of Americans say they are heterosexual or straight, and 7.6% do not answer the question about their sexual orientation. Gallup's 2012-2017 data had roughly 5% "no opinion" responses.

The latest results are based on more than 15,000 interviews conducted throughout 2020 with Americans aged 18 and older. Gallup had previously reported annual updates from its 2012-2017 daily tracking survey data but did not routinely measure LGBT identification in 2018 or 2019.

The identity question asked in 2020 offers a greater level of detail than the question asked in previous years. 

Now, respondents indicate their precise sexual orientation, rather than simply answering "yes" or "no" to whether they identify as lesbian, gay, bisexual or transgender.

Different approaches to measuring LGBT status can produce varying estimates of its incidence in the U.S. population. 

Results from Gallup's new question appears comparable to those from its prior question.

 The 1.1-percentage-point increase in the 2020 estimate (using the new question) compared with the 2017 estimate (using the old question) is about what would have been predicted from the recent trends. The LGBT percentage rose an average of 0.3 points per year in 2016 and 2017. Assuming that trend continued in the past three years, the total increase would have been about one percentage point.

More than half of LGBT adults (54.6%) identify as bisexual. About a quarter (24.5%) say they are gay, with 11.7% identifying as lesbian and 11.3% as transgender. 

An additional 3.3% volunteer another non-heterosexual preference or term to describe their sexual orientation, such as queer or same-gender-loving. Respondents can give multiple responses when describing their sexual identity; thus, the totals exceed 100%.

Rebasing these percentages to represent their share of the U.S. adult population finds 3.1% of Americans identifying as bisexual, 1.4% as gay, 0.7% as lesbian and 0.6% as transgender.

One of the main reasons LGBT identification has been increasing over time is that younger generations are far more likely to consider themselves to be something other than heterosexual. This includes about one in six adult Generation Z members (those aged 18 to 23 in 2020).

LGBT identification is lower in each older generation, including 2% or less Americans born before 1965 (aged 56 and older in 2020).

The vast majority of Generation Z adults who identify as LGBT -- 72% -- say they are bisexual. Thus, 11.5% of all Gen Z adults in the U.S. say they are bisexual, with about 2% identifying as gay, lesbian or transgender.

About half of millennials (those aged 24 to 39 in 2020) who identify as LGBT say they are bisexual. In older age groups, expressed bisexual preference is not significantly more common than expressed gay or lesbian preference.

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