How Many People are Lesbian, Gay, Bisexual and Transgender?

In April 2011, the Williams Institute at the UCLA School of Law did a study to answer this question.

Drawing on information from four recent national and two state-level population-based surveys, the analyses suggest that there are more than 8 million adults in the US who are lesbian, gay, or bisexual, comprising 3.5% of the adult population. In total, the study suggests that approximately 9 million Americans – roughly the population of New Jersey – identify as LGBT.

Among adults who identify as lesbian, gay, or bisexual, bisexuals comprise a slight majority (1.8% compared to 1.7% who identify as lesbian or gay); women are substantially more likely than men to identify as bisexual; estimates of those who report any lifetime same-sex sexual behavior and any same-sex sexual attraction are substantially higher than estimates of those who identify as lesbian, gay, or bisexual. There are also nearly 700,000 transgender individuals in the US. An estimated 19 million Americans (8.2%) report that they have engaged in same-sex sexual behavior and nearly 25.6 million Americans (11%) acknowledge at least some same-sex sexual attraction.

The study is available in PDF format by clicking this link.