Research Summary In 1999, three communities were selected to participate in a research demonstration designed to test the feasibility and impact of a coordinated response to intimate partner violence that involved the courts and justice agencies in a central role. The primary goals of the Judicial Oversight Demonstration (JOD) were to increase victim safety, hold offenders accountable, and reduce repeat offending using coordinated community services and integrated justice system policies in intimate partner violence court cases. The partnerships differed from earlier coordinated community responses to domestic violence by placing special focus on the role of the court, specifically the judge, to facilitate offender accountability in collaboration with both nonprofit service providers and other criminal justice agencies. This article presents the results of an impact evaluation of this demonstration in all sites. The demonstration received mostly positive responses from justice system agencies, service providers, offenders, and victims. Improvements were made in offender monitoring, consistent sanctioning, and increased supervision. However, these changes did not translate into gains in victim perceptions of their safety or into reductions in repeat violence in all sites. Policy Implications The demonstration had minimal impact on changing offender attitudes and behavior. The mixed results of the evaluation indicate that the most effective justice system responses to intimate partner violence must include a focus on protecting victims, close monitoring of offenders, and rapid responses with penalties when violations of court‐ordered conditions are detected. Indications were found that JOD strategies were effective for some subgroups, including younger offenders with fewer ties to the victim and offenders with extensive arrest histories. The observed reductions in intimate partner violence in selected subgroups in the JOD sites may suggest a fruitful way to begin designing new intervention strategies, including prevention programs for men and women.