Building Understanding: Youth Mental Health and Well-Being in Colorado, the 2023 edition of "KIDS COUNT in Colorado!," spotlights trends in youth mental health and access to care. It includes an overview of the most recent data on the topic and offers recommendations for policy action to promote youth mental health in the years ahead. The 30th annual "KIDS COUNT in Colorado!" report also tracks the well-being of Colorado children statewide and at the county level in the areas of family economic prosperity, child and family health, early childhood learning and development, and youth success. The report highlights promising programs and efforts to support youth mental health across the state. It also features insights from young people as part of a partnership with the YouthScan Project, a statewide digital initiative that puts youth voices front and center in the decisions that impact their lives. "KIDS COUNT" in Colorado! is part of the Annie E. Casey Foundation's national "KIDS COUNT" project. "KIDS COUNT" serves as an important source of quality, unbiased information on children and families for decision-makers and child advocates. [For the 2022 report, see ED626370.]