Integration of social services (e.g., civil registration, community mobilization) with public health and primary care has been recommended as a key strategy by practitioners, researchers and policy-makers to solve the multifactorial determinants of chronic diseases. Despite efforts to increase service integration in the past 50 years, there is limited evidence on effective approaches to integrating myriad services. Our study investigated the influence of individual- and organizational-level factors, and job characteristics on service integration using 262 providers from Brazil’s Family Health Strategy (ESF) team. Brazil’s Unified Health System (SUS) is acknowledged worldwide as a model for studying integration as ESF transdisciplinary teams, which comprise of community health workers (CHWs), nurses, and physicians, are mandated to integrate services.