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Total correctional population
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The total correctional population consists of all offenders under the supervision of the adult correctional systems, which includes offenders supervised in the community under the authority of probation or parole agencies and those held in the custody of state and federal prisons or local jails. Several different data collections are used to estimate the total correctional population; they include the National Prisoner Statistics, Annual Survey of Jails, Census of Jail Inmates, and Annual Probation Survey and Annual Parole Survey (listed under data sources). The basic count for the correctional population is updated annually in the Correctional Populations in the United States series.

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Community corrections Community corrections refers to the supervision of criminal offenders in the resident population, as opposed to confining them in secure correctional facilities. The two main types of community corrections supervision are probation and parole. Community corrections is also referred to as community supervision.
 
Incarcerated population Incarcerated population is the population of inmates confined in a prison or a jail. This may also include halfway-houses, bootcamps, weekend programs, and other entities in which individuals are locked up overnight.
 
Jail inmates Jail inmates are offenders confined in short-term facilities that are usually administered by a local law enforcement agency and that are intended for adults but sometimes hold juveniles before or after adjudication. Jail inmates usually have a sentence of less than 1 year or are being held pending a trial, awaiting sentencing, or awaiting transfer to other facilities after a conviction.
 
Parole Parole refers to criminal offenders who are conditionally released from prison to serve the remaining portion of their sentence in the community. Prisoners may be released to parole by a parole board decision (discretionary release/discretionary parole), according to provisions of a statute (mandatory release/mandatory parole), through other types of post-custody conditional supervision, or as the result of a sentence to a term of supervised release. In the federal system, a term of supervised release is a sentence to a fixed period of supervision in the community that follows a sentence to a period of incarceration in federal prison, both of which are ordered at the time of sentencing by a federal judge. Parolees can have a number of different supervision statuses including active supervision, which means they are required to regularly report to a parole authority in person, by mail, or by telephone. Some parolees may be on an inactive status which means they are excluded from regularly reporting, and that could be due to a number of reasons. For instance, some may receive a reduction in supervision, possibly due to compliance or meeting all required conditions before the parole sentence terminates, and therefore may be moved from an active to inactive status. Other supervision statues include parolees who only have financial conditions remaining, have absconded, or who have active warrants. Parolees are also typically required to fulfill certain conditions and adhere to specific rules of conduct while in the community. Failure to comply with any of the conditions can result in a return to incarceration.
 
Prison Compared to jail facilities, prisons are longer-term facilities owned by a state or by the Federal Government. Prisons typically hold felons and persons with sentences of more than a year; however, the sentence length may vary by state. Six states (Connecticut, Rhode Island, Vermont, Delaware, Alaska, and Hawaii) have an integrated correctional system that combines jails and prisons. There are a small number of private prisons, facilities that are run by private prison corporations whose services and beds are contracted out by state or federal governments.