Beginning in 1980 the Annual Probation Survey and Annual Parole Survey collected data on the total number of persons supervised in the community on January 1 and December 31 of each year and on the number of persons entering and exiting supervision during the year. These surveys cover the federal system, all 50 states, and the District of Columbia. The Bureau of Justice Statistics (BJS) depends entirely upon the voluntary participation of the state central reporters and the separate state, county, and court agencies for the annual probation and parole data.
In 2007 the U.S. Census Bureau served as the BJS collection agent, except for the federal system. Data for the federal system were provided directly to BJS through the BJS Federal Justice Statistics Program which obtained data from the Office of Probation and Pretrial Services, Administrative Office of the United States Courts.
Because many states update their population counts, the January 1, 2007, numbers may differ from those previously
published for December 31, 2006.