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An official website of the United States government, Department of Justice.


Survey of Prison Inmates (SPI)

Survey of Prison Inmates (SPI) is a periodic, cross-sectional survey of the state and sentenced federal prison populations.

National Prisoner Statistics Program (NPS) and the National Corrections Reporting Program (NCRP) 2015-2019

Closing Date
The NPS and NCRP are flagship data collections for BJS that measure the size and nature of state and federal prison populations on an annual basis. The two collections complement each other by obtaining aggregate and detailed individual-level information on prisoners for use in characterizing the prison population over time, as well use in statistical analyses that have policy implications. The NPS collects aggregate counts of the male and female custody and jurisdictional prison populations on December 31st of each year.