Collect administrative data from probation and parole agencies in the United States. Data collected include the total number of adults on state and federal probation and parole on January 1 and December 31 of each year, the number of adults entering and exiting probation and parole supervision each year, and the characteristics of adults under the supervision of probation and parole agencies. Published data include both national- and state-level data. The surveys cover all 50 states, the federal system, and the District of Columbia. They began in 1980 and are conducted annually.
— Read on bjs.ojp.gov/data-collection/annual-probation-survey-and-annual-parole-survey