This paper presents and analyzes the relationships between organizational properties (centralization of authority, formalization, workers' autonomy, coordination, control, empowerment, and training) and organizational effectiveness in three types of nonprofit human service organizations: community centers, home care organizations, and residential boarding schools. The findings indicate that the distinctive properties of each type of organization, in addition to presenting a comparative analysis of the factors that contribute toward attainment of organizational effectiveness. It discusses the theoretical and practical implications of the findings for management of nonprofit organizations. This paper describes and analyzes the relationships between organizational properties and organizational effectiveness in three types of nonprofit organizations that provide personal, social, and community services. Home care organizations, residential boarding schools, and community centers.