The central question investigated in this study is the public costs for people in supportive housing compared to similar people that are homeless. The typical public cost for residents in supportive housing is $605 a month. The typical public cost for similar homeless persons is $2,897, five-times greater than their counterparts that are housed. This remarkable finding demonstrates that practical, tangible public benefits result from providing supportive housing for vulnerable homeless individuals. The stabilizing effect of housing plus supportive care is demonstrated by a 79 percent reduction in public costs for these residents.