As required by law, state education agencies receiving funds under the Stewart B. McKinney Homeless Assistance Act submitted reports on the number and location of homeless children and youth in their states to the U.S. Department of Education. These reports also include data on the nature and extent of problems of access to education and student placement in elementary and secondary schools. Sixteen states submitted data from calendar year 1990, 12 states submitted data collected at least partly during 1990, and the balance submitted data in 1991. The major difficulty states faced in attempting to establish yearly counts was the risk of double-counting since children may be housed in more than one shelter in a given year. This report: (1) presents the total numbers of homeless children and youth by state (the 50 states, the District of Columbia, and outlying U.S. territories), and by grade level, type of housing, and school attendance; (2) summarizes the methodologies used to collect the data; and (3) summarizes data on special needs students. Excluding preschool children, states reported 327,416 homeless school-age children and youths (48.6 percent were elementary school students, 21.2 percent were junior high school students, 24.4 percent were high school students, and 5.8 percent were of unspecified grade levels). Four tables contain the data. Attachments include guidelines about the definition of homeless and a discussion of methodology, with questions and answers on counting procedures, and an outline of significant aspects of Title VII-B of the McKinney Act. (SLD)