Highlights from this report on adult female admissions to and exits from Illinois prisons include the following: the significant increase in adult female admissions as well as prison exits in Illinois between 1989 and 2005 was primarily a result of increased admissions for drug-law violations; between 1989 and 1999, female court admissions for drug delivery/sale increased significantly compared to admissions for drug possession, before beginning a steady decline through 2011; the majority of females sentenced to prison during the study period were convicted of the least serious felony classes of crimes (Class 3 and 4 felonies); and during the study period, the age of females sentenced to prison in Illinois has been increasing, with 80 percent of females sentenced in 1989 being under the age of 36, while only 32 percent were under the age of 36 in 2011. This report from the Illinois Criminal Justice Information Authority presents trend data and characteristics for adult female admissions to and exits from Illinois prisons. Data for the report came from exiting data collected by the Illinois Department of Corrections and Illinois criminal history record information maintained by the Illinois Criminal Justice Information Authority. The analysis examined data for the period coving State fiscal year 1989 through State fiscal year 2011. The analyses presented in this report highlight the differences in trends between adult female admissions to Illinois prisons as compared to adult male admissions. 4 tables, 13 figures, and 6 references