This paper describes a school-based mental health model for identifying, intervening, and referring students who are at risk for, or are exhibiting, mental health problems. This paper describes the County Schools Mental Health Coalition as a model for improving mental health outcomes for youth. The County Schools Mental Health Coalition, referred to here as the Coalition, is a multidisciplinary collaborative among six independent school districts and private schools residing in one county, and school psychology and social work faculty researchers from the local university. The Coalition was formed to overcome several barriers to children and youth receiving mental health supports. The barriers include lack of systems to adequately identify students early before mental health issues become severe, and lack of provision or access to evidence-based practices and interventions (EBPs) to ameliorate concerns or promote positive youth development. The manuscript describes how the Coalition has sought to overcome the barriers to support youth in county schools grades K to 12 through the creation of a tiered comprehensive system of early identification, prevention, and implementation of EBPs. The process and procedures utilized within this comprehensive data-based model are detailed, including how universal screening data are used at the county, school district, school, grade level, and individual student levels. In addition, case examples of universal, selective, and indicated interventions within this model are provided. Implications for research, practice, and policy will be discussed.