The below is borrowed from the National Alliance to End Homelessness
The Big Picture
While circumstances can vary, the main reason people experience homelessness is because they cannot find housing they can afford. It is the scarcity of affordable housing in the United States, particularly in more urban areas where homelessness is more prevalent, that is behind their inability to acquire or maintain housing.
By the numbers:
In January 2015, 564,708 people were homeless on a given night in the United States.
Of that number, 206,286 were people in families, and
358,422 were individuals.
About 15 percent of the homeless population - 83,170 - are considered "chronically homeless” individuals.
About 2 percent - 13,105 - are considered "chronically homeless” people in families.
About 8 percent of homeless people- 47,725 - are veterans
Four main specific groups experience homelessness:
Homeless families are similar to other poor families.
Typically, families become homeless as a result of some unforeseen financial crisis - a medical emergency, a car accident, a death in the family - that prevents them from being able to hold on to housing.
Most homeless families are able to bounce back from homelessness quickly, with relatively little public assistance. Usually, homeless families require rent assistance, housing placement services, job assistance, and other short-term, one-time services before being able to return to independence and stability.
For more information about homeless families, solutions to family homelessness, and policies addressing the issue, please visit the families section of our website.
Young people often become homeless due to family conflict, including divorce, neglect, or abuse. A large majority of young people experience short-term homelessness, returning back home or to family/friends.
Youth homelessness presents a particular challenge for several reasons, including the fact that there is very little definitive data on the population, as this group often doesn’t interact with standard homeless assistance programs or government agencies. Moreover, the solutions that have been identified for homelessness in general are often not applicable to minors (who are, for example, ineligible to rent an apartment). These special challenges mean that solutions to youth homelessness require innovation.
Veterans often become homeless due to war-related disabilities. For a variety of reasons – physical disability, mental anguish, post-traumatic stress, etc. – many veterans find readjusting to civilian life difficult. Difficulties readjusting can give rise to dangerous behaviors, including addiction, abuse, and violence, which, coupled with the difficulties, can lead to homelessness.
Preventive measures, including job placement services, medical services, housing assistance, and the like, can mitigate the risk of veterans experiencing homelessness.
Chronic homelessness is often the public face of homelessness. "Chronic" has a specific definition, involving either long-term and/or repeated bouts of homelessness coupled with disability (physical or mental). People experiencing chronic homelessness often end up living in shelters and consume a plurality of the homeless assistance system’s resources.
It’s a common misconception that this group represents the majority of the homelessness population. Rather, they account for less than 15 percent of the entire homeless population on a given day.
Fortunately, there has been significant progress to address chronic homelessness in the last decade. The number of individuals experiencing chronic homelessness has declined by 21 percent since 2010.