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State Prison Overcrowding and Capacity Data

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  3. State Prison Overcrowding and Capacity Data

Prison cells.

Original story by Ryan Spohn, Nebraska Center for Justice Research | Visualizations by and story updated by Melanie Kiper, 5/3/2020

Prison overcrowding has become a growing social problem in the United States as state incarceration rates increased from the 1970s, peaking in 2008. Although some states have experienced recent decreases in prison overcrowding, often as a result of “justice reinvestment” initiatives and reform efforts, overcrowding remains a significant problem in many state correctional systems. We use data from Table 17 of the Bureau of Justice Statistic’s Prisoners in 2019 report to examine rates of prison overcrowding across states.

Our analysis compares rates of operational capacity across states, indicating that Midwestern states such as Nebraska and Iowa lead the nation in rates of prison overcrowding compared to their rated operational capacity. In comparison to Iowa’s nation-leading prison overcrowding rate of 119.0%, Rhode Island reported by far the lowest level of overcrowding at 68.3%, followed by Tennessee at 75.3%. It is worth noting that Nebraska and other select states utilize their own definitions that differ from the federal definition for capacity, so statistics are not entirely comparable across states.

Examinations of prison overcrowding can further be challenging as multiple measures of capacity exist. For example, “design capacity” is the number of inmates a facility can hold according to the architect or planner and represents the lowest capacity estimate, but this measure is not provided by all states. Looking at this latter measure, Alabama leads all states at 175.7% of design capacity, whereas Nebraska comes in third at 156.9%. One additional caveat of state incarceration crowding measures is that they reflect the entire state correctional system, whereas individual facilities within the system may face rates of crowding that are substantially over or under the state mean rate.

2019 Prison Capacity

    Download 2019 data. | Download 2018 data. | Download 2017 data.

    Definitions

    Design capacity: Number of inmates who can be held based on facility's architect or planner.

    Operational capacity: Number of inmates who can be held based on staffing and services.

    Rated capacity: Refers to inmates or beds a facility can accommodate, set be a rating official.

    Prison population: Prisoners in custody of a prison system, "regardless of sentence length or the authority with jurisdiction over the prisoner."

    Notes

    See U.S. Department of Justice reports for complete set of notes.

    Related Stories

    State Rates of Imprisonment: 1978-2017

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