Post-high school enrollment plans and specific choices of May 1980 Kentucky high school graduates were studied based on longitudinal data. The relationships between these choices and academic and personal background characteristics and future plans were analyzed. The analyses include both education-bound and noneducation-bound graduates, and provide a general basis for identifying marginal enrollment groups: education-bound graduates who do not enroll, and noneducation-bound graduates who do enroll. Patterns of changes in institutional choices are also described. Data were drawn from the initial survey of plans and first followup survey of the Kentucky Longitudinal Study, a statewide educational research project of the Kentucky Council on Higher Education. For the main follow-up sample of 1,881 individuals, results indicate that 84.4 percent of graduates had implemented their post-high school educational plans. Information is presented on: the relative shares of expected and actual enrollments for nine postsecondary institution sectors; group means of academic performance, self-rated abilities, and personal/family background variables for four groups of graduates and also for four major institutional sectors; and changes in institutional choice. With respect to college attendance in general, the results indicate that more academically able students from more affluent and better educated families are more likely to attend college immediately after high school. However, the family income of students enrolling in Kentucky private 4-year colleges is significantly lower than that of students enrolling in state 4-year colleges. Additionally, students coming to the institution from greater distances and those with weaker initial preferences for the school clearly constitute a high-risk population. (SW)