Homelessness research

http://www.nhchc.org/Children/sld018.htm

http://www.camillushouse.org/camillus_resources/homelessness.php

http://www.chicagohomeless.org/factsfigures/causesandfacts.htm

http://www.homelessresourcenetwork.org/causes.html

http://www.homelessagency.ie/about_homelessness/causes.html

http://en.wikipedia.org/wiki/Homelessness

http://www.cbc.ca/fifth/main_nowayhome_causes.html

http://anitraweb.org/homelessness/faqs/causes/index.html (good one)

Main causes of homelessness

The major reasons and causes for homelessness as documented by many reports and studies include:

• Lack of affordable housing
• Substance abuse and lack of needed services
• Mental illness and lack of needed services
• Domestic violence
• Poverty, caused by many factors
• Prison release and re-entry into society
• Lack of affordable healthcare
• Natural Disaster
• Lack of education
• Lack of economic resources
  
• there are also voluntary homeless people (nomads), but i guess that doesn't count.