Community schools are an evidence-based strategy to advance a "whole child" approach to education by offering integrated student supports (e.g., health care or housing assistance), expanded and enriched learning time, family and community engagement, and collaborative leadership and practices. This brief from the Learning Policy Institute examines how local government and nonprofit agencies in two California counties—Los Angeles and Alameda—have provided technical assistance to support community school initiatives. Evidence from these two counties indicates that (1) county offices are well positioned to form cross-sector partnerships that efficiently integrate a comprehensive suite of services in local schools; (2) cross-sector partnerships are strengthened by a shared vision and clear agreements among partners; and (3) a multi-tiered system of support (MTSS) and a coordination of services team (COST) can help partners coordinate, deploy, and target their resources efficiently at school sites.