This document contains a narrative and tables which provide information on the characteristics of the California Youth Authority's institution, camp, and parole populations as of June 30 of each year, 1977 through 1986. The characteristics compared in the report include committing court, county of commitment, admission status, ethnicity, Youthful Offender Parole Board status, average age, and four categories of commitment offenses (violent offenses, property offenses, narcotic and drug offenses, and other offenses). A summary section discusses changes which have occurred in the Youth Authority's population over the 10-year period examined. Seven data tables support the text. A highlights section explains the policy and legislative actions which may have had an effect on Youth Authority populations over the years, and recommends considering those effects when interpreting data. (NB)