Cooperative support organizations have been increasingly recognized as an important part of developing integrated worker cooperative systems. This paper focuses on cooperative development agencies (CDAs), which have received public and private support mainly for the purposes of creating and retaining local jobs through cooperative development. This paper is a case study of two CDAs in Philadelphia, the Philadelphia Association of Cooperative Enterprise (PACE) and the O&O Investment Fund. It examines the context in which they have developed, the interests involved, their structures and financing, and the roles they have undertaken.