Systemic inequities in Puerto Rico—where 39.6% of the general population and 54.3% of children live in poverty—profoundly impact maternal and child health. Children face significant mental health challenges stemming from structural, social, and environmental disadvantages, which intensify family conflict, increase the risk of child maltreatment, and hinder positive parenting. A major barrier to addressing these inequities is limited community access to reliable data. Poor data quality, restricted access, unclear governance, and limited analytical capacity impede informed decision-making, perpetuating disparities. This presentation introduces an initiative to strengthen local capacity in 21 municipalities in Puerto Rico's southwest region to adopt equitable data practices in maternal and child health. The project scales up ComPASS-PR's Data Hub and leverages the Health Equity Research Assembly (HERA), a coalition of more than 32 organizations representing government, nonprofit, professional, and community stakeholders. Through a collective impact approach, the initiative promotes inclusive collaboration with data keepers, curators, and consumers. The project unfolds in three phases: (1) Planning (July-September 2025): collaborative design, pilot testing of tools, and stakeholder engagement; (2) Implementation (September 2025-February 2026): surveys and key informant interviews (N=20-30), analyzed with SPSS and NVivo; (3) Transitional-Closing (March-April 2026): dissemination events, development of a data governance framework, and identification of barriers and facilitators to collaborative practices. Expected outcomes include a roadmap for local data governance, best practices for engaging diverse data stakeholders, and actionable strategies to address capacity gaps. By socializing data through science-policy-society interfaces, this initiative fosters dialogue, participation, and the production of "serviceable truths" that integrate diverse perspectives. Advancing community-driven data equity is essential to building systemic capacity for maternal and child health equity in Puerto Rico and offers a replicable model for other underserved contexts.