Background: Hospital investments in care coordination services and innovative delivery models represent an important source for improving care efficiency and population health. Objective: The aim of this study was to explore variation of hospital-initiated care coordination services and participation in Accountable Care Organizations (ACOs) by community characteristics within an organizational theory framework. Methods: Our main data sets included the 2015 American Hospital Association Annual Survey, Survey of Care Systems and Payment, American Community Survey, and Area Health Resource File. Two main outcomes were (a) hospitalreported initiation of care coordination practices (such as chronic disease management, post-hospital discharge continuity of care, and predictive analytics) and (b) participation in ACO models. State fixed-effects models were used to test the association between the adoption of care coordination practices and hospital characteristics, communitylevel sociodemographic characteristics, and health policies. Results: Hospitals with large bed size, located in urban areas, and/or with high volume of operations were more likely