This report presents detailed tabulations of data on school enrollment of the civilian noninstitutionalized population in October 1991. It also includes summary time series of data from the beginning of the survey since 1946. These data cover enrollment in regular schooling from nursery school through college and professional school. Data are broken down by: (1) age; (2) sex; (3) race; (4) Hispanic origin; (5) marital status; (6) family status; (7) family income; (8) education of the householder; (9) labor force status; (10) metropolitan residence; (11) region; and (12) mother's labor force status and education. Enrollment characteristics include level and grade of school, public or private status, full- or part-time attendance, and two-year or four-year college. Vocational school enrollment is shown separately. In October 1991, approximately 63.9 million persons were enrolled in regular school, with about 61.3 million between the ages of 3 and 34. While nursery school and kindergarten enrollments were approximately equal to those of the preceding year, enrollment in elementary school was up approximately 0.6 million persons, and high school enrollment was nearly 0.3 million higher. Neither the dropout rate nor the dropout pool changed significantly. College enrollment rose by approximately 0.5 million. Appendices contain supplementary tables, definitions, explanations, and a discussion of the source and accuracy of the tables. Four figures, 7 text tables, 19 detailed tables, and 12 appendix tables present data in concise form. (SLD)