Other groups

In 2010, the Washington Post estimated that there were 11 million illegal immigrants in the country.^[56]

There were about 2 million people in prison in 2010.^[57]

The 2000 U.S. Census counted same-sex couples in an oblique way; asking the sex and the relationship to the "main householder", whose sex was also asked. One organization specializing in analyzing gay demographic data reported, based on this count in the 2000 census and in the 2000 supplementary survey, that same-sex couples comprised between 0.99% and 1.13% of U.S. couples in 2000.^[58] A 2006 report issued by The Williams Institute on Sexual Orientation concluded that the number of same-sex couples in the U.S. grew from 2000 to 2005, from nearly 600,000 couples in 2000 to almost 777,000 in 2005. 4.1% of Americans aged 18–45 identify as gay, lesbian, or bisexual^[59]

A 2011 report by the Institute estimated that 4 million adults identify as gay or lesbian, representing 1.7% of the population over 18. A spokesperson said that, until recently, few studies have tried to eliminate people who had occasionally undertaken homosexual behavior or entertained homosexual thoughts, from people who identified as lesbian or gay.^[60] (Older estimates have varied depending on methodology and timing; see Demographics of sexual orientation for a list of studies.) The American Community Survey from the 2000 U.S. Census estimated 776,943 same-sex couple households in the country as a whole, representing about 0.5% of the population.^[59]

Less than 1% of Americans serve in the Armed Forces.^[61]