In 2004, the Aspen Institute Roundtable on Community Change emphasized the need for a comprehensive base of information on the effectiveness of community collaborations for youth--an accessible, evidence-rich resource that could guide local efforts to bring about meaningful change. Nearly 10 years later, this need remains largely unmet. In communities across the country, cross-sector partnerships are working to improve the lives of young people. As the number of these collaborations has grown dramatically in recent years, an accurate, up-to date understanding of the outcomes of such efforts is even more essential than it was a decade ago. To help close the current gap between research and practice, an exhaustive review of the existing research and evaluations of collaborative community efforts was undertaken. This brief reviews collaborations that have targeted public health and broader youth development outcomes and those whose efforts have been evaluated.