This directory lists all reported public elementary and secondary education agencies in 50 states, the District of Columbia, five outlying districts (American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the Virgin Islands), and the Department of Defense. Types of agencies include regular school districts, supervisory union administrative centers, regional educational service agencies, state-operated agencies, federally operated agencies, and other agencies. The introduction has several summary tables. Table 1 shows number and percentage of education agencies by type and by state. Regular school districts comprise over 90 percent of all agencies listed. Table 2 indicates what percentage of 14,766 regular school districts, by pupil membership, serve what percentage of students. Although school districts in three categories representing the largest districts comprise only 5.2 percent of all school districts, they serve 48.8 percent of all public school students. Table 3 provides a breakdown of regular school districts by grade span and membership. Table 4 gives a breakdown of regular school districts by grade span and by state. Table 5 shows the number of regular school districts in each size category by state. Table 6 shows the number of regular school districts with student membership in each state and indicates the number of students in districts at selected percentile intervals on an ascending size scale. The median U.S. school district has 1,052 pupils. Following the actual tables and the school universe listing are appendices containing state education agency addresses and sample survey forms. (MLH)