Estimated homeless figures in the United States range from 600,000 to 2.5 million.
Of the homeless population:
39% are under the age of 18,
5% are unaccompanied minors,
40% are families with children,
41% are single males,
14% are single females.
23% are veterans,
30% have been homeless for more than 2 years.
Sources: http://www.fas.org, 2009, International Journal of Psychosocial Research, 2008, National Coalition for the Homeless