Services offered through Part C of the Individuals With Disabilities Education Improvement Act improve cognitive, behavioral, and physical skills for children less than 3 years old at risk for or with a disability. However, there are low enrollment rates into services. Various Lead Agencies oversee services through Part C, and states determine which agency is in charge of administering these services. The objective of this study was to describe odds of enrollment into early intervention services based on the department administering services (Lead Agency). Each state's Lead Agency (Education, Health, or Other), state population size, narrowness of eligibility criteria, and state-level screening rates were fit into a negative binomial regression model to predict odds of enrollment into Part C services. Results show that state's reporting from "Health" and "Other" as a Lead Agency had significantly higher odds for Part C services compared with the state Lead Agency of Education (Health adjusted odds ratio [AOR] = 1.56, 95% confidence interval [CI] = [1.557, 1.561]; Other AOR = 2.40, 95% CI = [2.401, 2.405]). Further research should describe unique components of a Lead Agency's administrative practices that contribute to the variation in enrollment. This study was an important step toward the investigation of low enrollment rates into Part C services.