Estimated rate of persons supervised by US adult correctional systems, by correctional status, 2000 and 2005–2015

In 2015, the US adult correctional system had under its supervision one in every 37 US adults, which is a rate of 2,710 people under supervision per 100,000 US residents aged 18 or older. More broadly, that's a rate of 2,090 per 100,000 US residents of all ages.
The rate for the population on community supervision, i.e. probation and parole, in 2015 was 1,870 per 100,000 US residents aged 18 or older, and 1,440 per 100,000 US residents of all ages.
The rate for the incarcerated population, in jails and prisons, in 2015 was 870 per 100,000 US residents aged 18 or older, and 670 per 100,000 US residents of all ages.

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Source: 

Danielle Kaeble and Lauren Glaze, "Correctional Populations in the United States, 2015," (Washington, DC: US Dept. of Justice Bureau of Justice Statistics, December 2016), NCJ250374, Table 4, p. 4.
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