This document uses data from the National Center for Education Statistics' 1987-88 and 1990-91 Schools and Staffing Survey (SASS) to address questions about the proportions of school principals who are women. Findings indicate that women are increasingly holding public school principalships; however, there are still more women principals in the private schools than in the public schools. Despite the increase of female public-school principals and the relatively high proportion of women principals in private education, the proportion of women principals remains much smaller than the proportion of female teachers. During the 1987-88 and 1990-91 school years, the rise in the proportion of women public-school principals occurred primarily in elementary and combined schools. Although the proportion remained the same for private schools, there were still more private-school female principals in the 1990-91 school year than there were women principals in the public schools. Two data tables are included. (LMI)