The authors are indebted to Health Information Services of Manitoba Health, and the Office of Vital Statistics in the Agency of Consumer and Corporate Affairs, for the provision of data. [...] We also acknowledge the financial support of the Department of Health of the Province of Manitoba. [...] This report is designed to provide an overview of population- based indicators on the prevalence of mental illness, and the patterns of health care use of those diagnosed with mental illness. [...] The key comparisons by mental disorder grouping—”cumulative” versus “no disorder” In most of the graphs of this report, the rates of service use of those having one or more of the cumulative mental illness disorders is compared to the rate of service use of those having no disorder.