Every state can create secure, robust linkages between early childhood and K-12 data systems, and effectively use the information from these linkages to implement initiatives to support programs and children, answer key policy questions, and be transparent about how the state's early childhood investments prepare students for success in school and beyond. While the linkages are technical mechanisms that enable a state to connect information housed in different data systems, this document addresses the policies and supports that enable a high-quality link rather than focusing on the technical aspects of this work. This document discusses steps states can take to enable early childhood and K-12 data linkages, and highlights seven key focus areas in this document: (1) state capacity; (2) data governance; (3) privacy, security, and transparency; (4) linking, matching, and sharing; (5) data quality; (6) data access and use; and (7) stakeholder engagement. [The following experts came together to develop this roadmap: Carolyn Cobb, Anna Colaner, Michelle Hill, Jaci Holmes, Carlise King, Colleen Murphy, Elliot Regenstein, and Nancy Widdoes.]