Data showing patterns in enrollment by institution and the demographic characteristics of students (part-time and full-time) at various program levels within the universities, colleges, and private trade schools in Ontario are examined, and emerging trends are assessed. Analysis is provided by institution, sex, age, legal status, province of residence and country of citizenship. Enrollment data, particularly where demographic characteristics are involved, are generally reported as of the fall term. Five academic years are covered: 1974-75 through 1978-79. Numerous enrollment trends are highlighted; for example: undergraduate enrollments in universities increased over the five-year period for both full-time and part-time students; enrollment in colleges in both postsecondary and non-postsecondary programs increased 1 percent; and increases in enrollment in occupational courses accounted for the greatest portion of increasing enrollment in part-time, non-postsecondary registration. Examples of the highlighted demographic trends are: the age distribution of students over the five-year period from 1974 to 1978 show little change; the proportion of women enrolled in colleges and universities has increased; the proportion of Canadian citizens and landed immigrants enrolled in the colleges full-time was 94.9 percent in 1974; 97.8 percent in 1978; and foreign student enrollment in full-time postsecondary programs in 1978 was primarily from Hong Kong, Nigeria and Guyana. (LC)