This blueprint, written to inform the efforts of researchers and analysts in local government agencies and in research settings, combines lessons learned from a wide-ranging literature review with the direct experience of Urban Institute (Urban) researchers, who collected, integrated, mapped, and analyzed interagency and cross-jurisdictional data from the Washington, DC, metropolitan area, a project referred to throughout this blueprint as Metropolitan Crime Mapping. The goal of this blueprint is to encourage similar projects by identifying the opportunities that cross-sectional analysis offers, suggesting strategies to overcome barriers that researchers may encounter, and providing an overview of what the future holds for cross-sector data sharing and analysis.