A wide variety of community organizations have the skills, resources, and motivation needed to address the challenges of jail reentry, including substance abuse treatment providers, homeless shelters, workforce development centers, neighborhood clinics, community colleges, and many others. This guidebook provides community-based organizations with an overview of jail reentry and concrete steps to develop and sustain a reentry partnership with their local jail. It also addresses difficulties that might arise, and provides examples of strong partnerships between CBOs and jails that serve as models.