Case management services have been implemented in suicide prevention programs. Aims: To investigate whether case management is an effective strategy for reducing the risks of repeated suicide attempts and completed suicides in a city with high suicide rates in northern Taiwan. Method: The Suicide Prevention Center of Keelung City (KSPC) was established in April 2005. Subjects included a consecutive sample of individuals (N = 2,496) registered in KSPC databases between January 1, 2006, and December 31, 2011, with at least one episode of nonfatal self-harm. Subjects were tracked for the duration of the study. Results: Of all the subjects, 1,013 (40.6%) received case management services; 416 (16.7%) had at least one other deliberate self-harm episode and 52 (2.1%) eventually died by suicide. No significant differences were found in the risks of repeated self-harm and completed suicides between suicide survivors who received case management and those who refused the services. However, a significant reduction in suicide rates was found after KSPC was established. Conclusion: Findings suggest that case management services might not reduce the risks of suicide repetition among suicide survivors during long-term follow-up. Future investigation is warranted to determine factors impacting the downward trend of suicide rates.