Total correctional population in United States
Total Correctional Population in United States 1980-2016.

The number of persons under the supervision of the US adult correctional systems has kept dropping for the ninth consecutive year in 2016.
A decrease of 18% has been recorded in the total adult population under the supervision of the US correctional systems between 2007 and 2016.
The adult correctional population has dropped from 3,210 to 2,640 per 100,000 adult residents (correctional supervision rate) from 2007 to 2016.
The average rate of decline in the size of the adult correctional population between 2007 and 2016 has been 1.2%.
Around 1 in 38 persons in the US were under correctional supervision in 2016.
The percentage of adults being supervised by the US correctional system was the lowest in 2o16 since 1993. An estimated 66,13, 500 people were being supervised by the US correctional system on December 31, 2016. This was 62,700 lower than on January 01, 2016.
The total correctional population in United States includes the persons under community supervision as well as the incarcerated population. At the year end, 2016, majority of persons under community supervision (either probation or parole) constituted the US correctional population.
Number of persons under probation was 36,73,100 whereas those under parole was 874,800 by year end, 2016.
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Sources:
Bureau of Justice Statistics.
https://www.bjs.gov/index.cfm?ty=pbdetail&iid=6226