the department of Justice just issued its 2006 year-end numbers for u.s. prison, jail, probation, and parole populations:

WASHINGTON – 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.

i haven’t standardized by population yet, but the increases are non-trivial.

prison: 1,492,973, up 3.1% over year-end 2005
jail: 766,010, up 2.5%,
parole: 798,202, up 2.3%
probation: 4,237,023, up 1.7%
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total: 7,211,400, up 2.3% from 7,051,900 at year-end 2005

click for 1980-2006 trend data.