Results are presented for the fourth annual survey of all U.S. school districts by Quality Educational Data, Inc. Findings are displayed in tabular form and include information on the following: market penetration by major brands of microcomputers in school districts and buildings; school districts that use microcomputers and the brand or combination of brands; growth patterns; relationship between the size of student enrollment and the likelihood of a district having microcomputers; the relationship of instructional dollars per pupil to the presence of microcomputers; shifts in the different brands of microcomputers utilized; the kinds of districts that have microcomputers and specific brands utilized; elementary, junior high, and senior high schools by enrollment with microcomputers; number of microcomputers by brand in the public schools; microcomputer usage by expenditure, enrollment, and grade level; microcomputer units by state; comparison of states with regard to number of students per micro; and the top 50 districts which use microcomputers. (JB)