This paper analyzes the preschool special education eligibility classifications and criteria used by states and the District of Columbia in compliance with Part B of the Individuals with Disabilities Education Act. Four types of eligibility classifications are described: use of only Part B disability categories; use of Part B categories plus a preschool-specific category/classification; use of some, but not all, Part B categories and a preschool-specific category that replaces omitted Part B categories; and use of no Part B categories. States' use of quantitative and qualitative criteria for preschool-specific category/classification is examined, with a state-by-state summary chart. The chart specifies the type of eligibility classification, the preschool-specific classification and criteria used for it, and notes on the use of Part B categories. (JDD)