Source: Bureau of Justice Statistics
From press release:
The U.S. adult correctional population — incarcerated or in the community — reached 7.2 million men and women, an increase of 159,500 during the year, the Justice Department’s Bureau of Justice Statistics (BJS) announced today in a new report. About 3.2 percent of the U.S. adult population, or 1 in every 31 adults, was in the nation’s prisons or jails or on probation or parole at the end of 2006.
The number of men and women who were being supervised on probation or parole in the United States at year-end 2006 reached 5 million for the first time, an increase of 87,852 (or 1.8 percent) during the year. A separate study found that on December 31, 2006, there were 1,570,861 inmates under state and federal jurisdiction, an increase of 42,932 (or 2.8 percent) in 2006.
Full Report (PDF; 306 KB)