This report, prepared from information collected from Colorado's public school districts for 64 counties, provides information about public school students grades K through 12. In fall 1991, there were 593,030 students in Colorado's public schools, representing a substantial increase for the second consecutive year, and surpassing the state's previous membership peak in 1972. Native Americans, Asian Americans, Blacks, and Hispanic Americans represented 25.1% of the total student population. The Denver metropolitan area includes 53.9% of the state's total student membership. The graduation rate for the class of 1991 was 78.9%. Eight tables comprising the bulk of this document present student information in the following areas: (1) state trends in student membership from fall 1987 through fall 1991 by district; (2) summary of selected school district data; (3) fall membership by school and grade; (4) fall membership by school district and ethnic/racial group; (5) ranking of Colorado school districts by 1991 fall membership; (6) 1991 graduates by district, ethnic and racial group, and sex; (7) graduation and completer rates by setting; and (8) state trends in public high school graduates 1978-91. Two illustrations in graph form summarize educational trends. (SLD)