The data presented in this report are from the 1986-87 school year public education agency universe survey of the Common Core of Data conducted annually by the Center for Education Statistics. Data for this report were provided by state education agencies from their administrative records. Six tables show the number and percentage of public elementary/secondary education agencies and school districts by state, type and size of agency, membership size, and grade span. Among the highlights are the following: (1) about 92 percent of all public education agencies are regular elementary and/or secondary school districts, as opposed to special purpose education agencies; (2) the median size of an education agency ranges from a low of 28 students in Nebraska to a high of 11,896 in Maryland; and (3) the largest 173 regular school districts served 27.9 percent of the national total number of students, while the 4,071 smallest school districts served 1.4 percent of all students. (MLF)