This study examined the prevalence of indicators of disability or potential disability among preschool-aged children enrolled in the Early Head Start Research and Evaluation Longitudinal Follow-Up. Three categories of indicators were established: received Part B services, developmental risk, and biological risk. The majority of participating children (62%) were classified into at least one category. Children living in poverty from birth through preschool and of minority status were among those most likely to be classified; these children were likely to have received a variety of services. The majority of children who received Part C services (79.8%) received Part B services as preschoolers, but 33% of the children with a developmental risk identified before age 3 continued to have a developmental risk during preschool yet did not receive specialized services. Results highlight the importance of understanding the relations among child and family characteristics and service receipt to inform policy and practice. (Contains 4 tables.)