Early intervention and preschool special education coordinators in the 50 states and territories were interviewed about the current status of professional development in-service systems in their state. A definition consisting of 8 components of an in-service professional development system was used to analyze the state systems. Twenty Part C early intervention systems had professional development in-service training models that met the definition, and 23 preschool special education in-service systems met the definition. Results on selected findings are presented and discussed within the context of developing effective in-service professional development systems for the early intervention and preschool special education workforce.