“The inaugural results of a new Gallup question — posed to more than 120,000 U.S. adults thus far” report Gary J. Gates and Frank Newport, “shows that 3.4% say “yes” when asked if they identify as lesbian, gay, bisexual, or transgender.” 4.4% refused to answer (or didn’t know).
This suggests that gay people make up about 4% of the population:
These results are based on responses to the question, “Do you, personally, identify as lesbian, gay, bisexual, or transgender?” included in 121,290 Gallup Daily tracking interviews conducted between June 1 and Sept. 30, 2012. This is the largest single study of the distribution of the lesbian, gay, bisexual, and transgender (LGBT) population in the U.S. on record. By comparison, the General Social Survey, a project of NORC at the University of Chicago, asked a sexual orientation question in its 2008 and 2010 survey of about 2,000 adults in each year. The U.S. Department of Health and Human Services’ National Survey of Family Growth asked a sexual orientation question of about 12,000 young adults aged 18 to 44 in 2002 and of more than 20,000 adults in its 2006-2010 survey. The 3.4% figure is similar to a 3.8% estimate made by one of the authors of this study (Gates), averaging a group of smaller U.S. surveys conducted from 2004 to 2008.