According to the most recent Bureau of Justice Statistics census, how many state and local law enforcement agencies employed at least one full-time-equivalent sworn officer, and as of what date?
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Criminal Justice & Criminology · Criminal Justice System
Police, Courts, and Corrections
On this page 9 sections
In 30 seconds
American criminal justice runs on three components. Police agencies investigate and arrest. Courts decide what charge to bring, whether the state proved it, and what sentence follows. Corrections agencies carry that sentence out, in a facility or in the community. A case is handed from one to the next, and every handoff is a decision someone can decline to make. The three are not divisions of one organization: they answer to different governments and draw separate budgets.
Why this matters
Most questions a criminal justice course asks - why arrests far outnumber convictions, why someone sits in jail A locally administered confinement facility holding people before and after arraignment and those serving sentences of about a year or less. Full entry → before any finding of guilt, why one county handles a case differently from the next - turn on which institution was deciding and who that institution answers to. Getting the map right first makes the rest of the field legible, because search law, plea bargaining, sentencing, and reentry each sit inside one of these three components and inherit its incentives. The map also explains a recurring frustration in practice: reform aimed at one component tends to stall at the boundary with the next, which has its own budget, its own appointing or electing authority, and no obligation to absorb the change.
The college version
Three components, three different decisions
The conventional map of criminal justice in the United States has three components. Police agencies detect offenses, investigate, and arrest. Courts decide what charge to bring, whether the government has proved it, and what sentence follows. Corrections agencies carry out whatever the court imposed, whether that means confinement or supervision in the community. Each component owns one class of decision, and each of those decisions is discretionary rather than automatic. The Bureau of Justice Statistics describes discretion operating at every stage: police choose whether to investigate or arrest, prosecutors whether to file charges, judges how to set bail and impose sentence, correctional officials how to house and classify people in custody, and paroling authorities when to release and on what conditions. BJS is equally explicit that there is no single criminal justice system in this country, only many similar systems that are individually unique, and that responding to crime is mainly a state and local function. That last point does most of the work in this lesson. Everything described here applies to the United States, and the specific arrangements vary substantially from state to state. The companion topic What Is Criminal Justice? takes up the system framing, Packer's competing models, and the attrition funnel; this lesson stays with the institutions themselves and the seams between them.
Policing: many agencies, and most of them small
Policing in the United States is not one organization but thousands. In its most recent census, BJS counted 17,541 state and local law enforcement agencies employing at least one full-time-equivalent sworn officer An employee granted arrest powers by law, as distinct from civilian staff who support an agency without those powers. Full entry → with general arrest powers as of June 30, 2018, together employing 1,214,000 full-time personnel - 788,000 sworn officers and 427,000 civilian staff. The familiar round figure of 'about 18,000 agencies' is a rounding of counts like this one, not a live tally; the number carries a reference date and should be quoted with it. The composition matters as much as the total. Local police departments accounted for 11,824 agencies (67%), sheriffs' offices for 3,051 (17%), special jurisdiction The legal authority of a government, agency, or official to act in a given territory or over a given class of case. Full entry → agencies such as campus, airport, and park police for 1,753 (10%), constable or marshal offices for 647 (4%), tribal agencies for 217 (1%), and primary state law enforcement agencies for just 49. Size is skewed to an extreme degree. In 2018, 7,055 agencies - 40% of the total - employed fewer than ten full-time-equivalent sworn officers, while the 80 agencies with 1,000 or more sworn officers made up half of one percent of agencies but employed 29% of all sworn personnel. The typical American police agency is small; the typical American police officer works in a large one. Sheriffs' offices sit awkwardly in this picture because many are not primarily patrol agencies. BJS excludes sheriffs' offices with only jail and court duties from its general-purpose agency counts, and defines a jail as a facility generally operated under the authority of a sheriff, police chief, or county or city administrator. A county sheriff is therefore frequently a corrections administrator as well as a law enforcement executive. Federal law enforcement is a separate and much smaller layer: 90 federal agencies employed 136,815 full-time officers with authority to make arrests and carry firearms in fiscal year 2020, nearly half of them (66,410) in the Department of Homeland Security and its Office of Inspector General.
Courts: two systems, two levels, and a gatekeeper
The United States runs two parallel court systems. Congress has established 94 U.S. District Courts and 13 U.S. Courts of Appeals beneath the Supreme Court created by Article III of the Constitution. Alongside them, each state maintains its own judiciary - trial courts, in most states an intermediate appellate level, and a court of last resort - and state courts are the final arbiters of state law. The Administrative Office of the U.S. Courts notes that state courts hear most criminal cases; federal criminal jurisdiction is limited to offenses Congress has defined. The two levels within each system do different work. A trial court The level at which evidence is presented, disputed facts are resolved, and a first judgment in a case is entered. Full entry → receives evidence, resolves disputed facts, and enters judgment. An appellate court A level that reviews the record of a lower court for legal error rather than hearing witnesses or receiving new evidence. Full entry → reviews the record of what the trial court did for legal error; it does not hear witnesses or take new evidence. The prosecutor is the gatekeeper of the whole component, and is not part of the judiciary at all. BJS describes state court prosecutors as serving in the executive branch of state government, with the chief prosecutor - district attorney, county attorney, commonwealth attorney, or state's attorney, depending on the state - answerable to the public as an elected or appointed official; its 2007 census counted 2,330 such offices. In Bordenkircher v. Hayes (1978), the Supreme Court stated that so long as a prosecutor has probable cause to believe the accused committed a statutory offense, the decision whether to prosecute and what charge to file 'generally rests entirely in his discretion,' subject to the constraint that selection may not be 'deliberately based upon an unjustifiable standard such as race, religion, or other arbitrary classification.' An arrest is a request for prosecution, not a commitment to one. Most of what courts produce is not trials. The U.S. Sentencing Commission reports that of 66,662 individuals sentenced in federal court in fiscal year 2025, 97.7% had pleaded guilty and 2.3% were convicted at trial, though the rate varies by offense - 99.7% of immigration cases resolved by plea, against 74.8% of murder cases. No comparable annual national series exists for the fifty state systems. The best-known figure for them comes from Missouri v. Frye (2012), where the Supreme Court, citing BJS data then available, put guilty pleas at ninety-seven percent of federal convictions and ninety-four percent of state convictions. Treat that state number as a 2012 statement resting on 2006 data, not as a current measurement. Court structure and the road from arrest to verdict are taken up in depth by Court Structure, Arrest Through Trial, and Plea Bargaining.
Corrections: three destinations, and where most people actually are
Corrections is three arrangements, not one. Jails are local. BJS defines a jail as a confinement facility generally run under the authority of a sheriff, police chief, or county or city administrator, holding people before and after arraignment - usually for more than 72 hours - and those sentenced to a year or less. At midyear 2023, local jails held 664,200 people, and 70% of them (467,600) were unconvicted, awaiting court action or held for other reasons; only 30% (196,600) were serving a sentence or awaiting sentencing. Turnover is fast: from July 2022 through June 2023, people spent an average of 32 days in custody before release. Jails are administered by roughly 2,848 local jail jurisdictions across the 45 states that do not combine the two systems. Prisons are state or federal and hold longer sentences. BJS defines a prison A long-term facility operated by a state or the federal government, typically holding people sentenced to more than one year. Full entry → as a long-term facility run by a state or the federal government, typically holding people sentenced to more than one year, with sentence length varying by state. At yearend 2023, 1,254,224 people were under state or federal prison jurisdiction: 1,097,597 under state authority and 156,627 under the Federal Bureau of Prisons. Ninety-six percent were serving sentences of more than a year. Six states - Alaska, Connecticut, Delaware, Hawaii, Rhode Island, and Vermont - run integrated systems that combine jails and prisons, which is why their entire confined population appears in prison statistics. The third arrangement is the largest and the least visible. At yearend 2023, about 5,530,300 adults were under correctional supervision in the United States. Of those, 3,772,000 were supervised in the community - 3,103,400 on probation and 680,400 on parole - while 1,852,900 were incarcerated in prisons or jails. community corrections Supervision of a person living in the community, on probation or parole, by a correctional agency rather than inside a facility. Full entry → supervises roughly two people for every one behind a wall. Note that BJS's published total is smaller than the sum of its parts, because some people occupy more than one status at once. Jails Versus Prisons and Probation and Parole develop each of these in detail.
The handoffs, and why there is no chain of command
Follow one case across the map. A municipal police department investigates and arrests, then hands the matter to a county prosecutor who decides whether to charge and with what. A trial judge sets release conditions; if the defendant is detained, the county jail run by the sheriff holds the person while the case is pending. The case resolves - almost always by plea - and the judge imposes a sentence. If that sentence is prison, a state department of corrections takes custody. If it is supervision, a probation agency takes it instead - and which level of government runs probation is itself one of the things that varies by state. On release, a paroling authority and a supervision agency may take over again. Every arrow in that sequence crosses an organizational boundary. BJS summarizes the division plainly: police protection is primarily a function of cities and towns, corrections is primarily a function of state governments, and most justice personnel are employed at the local level. Prosecutors sit in the executive branch of state government and answer to the public as elected or appointed officials, and in some states the county's key criminal justice officers are elected by constitutional command - California's constitution, for example, requires an elected county sheriff and an elected district attorney in every county. Arrangements differ from state to state, but the pattern holds: none of these officials supervises any other. Police cannot compel a charge, prosecutors cannot compel a sentence, and corrections agencies cannot decline an admission the court has ordered. Each has its own budget, its own appointing or electing authority, and its own measures of success. This is why coordination problems here are structural rather than the product of individual carelessness. A decision made in one component redistributes work and cost onto the next component, which had no vote in it and receives no corresponding money: charging and bail practices set by courts fill a jail the county pays for; sentencing practice set by state law fills prisons the legislature funds; supervision caseloads rise when releases increase. Understanding a criminal justice outcome usually means asking which institution made the decision, what it was optimizing, and who pays for the consequence. What each institution may lawfully do is a separate question, governed by federal constitutional law and by state law that varies considerably. This lesson describes how the institutions are arranged. It is educational material, not legal advice, and it takes no position on how any of these arrangements should change.
Eli explains
The same idea, in plain words
Explain it like I’m 10
Three very different kinds of workplace handle a criminal case, one after another. First there are police: people whose job is to find out what happened and, sometimes, to take someone into custody. Second there are courts: a building full of lawyers and judges who decide whether the government can prove the accusation and what should happen if it can. Third there is corrections: the jails, prisons, and supervision offices that carry out whatever the court decided. The part that surprises people is that these are not three departments of one big organization. The police usually work for a city, the sheriff and the prosecutor work for a county and in many places are put there by county voters, and the prison belongs to the state. Nobody is everybody's boss.
Picture it like this
Picture a relay race in which each runner has a different employer, a different coach, and a different rulebook about when to hand off the baton. The baton is the case, and it does move down the track. But each runner can slow down, speed up, or decline to take the baton at all, and nobody standing at the finish line has the authority to tell any of them how to run.
Where the picture stops working
The relay breaks down in two ways. Real cases do not all travel the same distance: many stop with the first runner when police close a matter without an arrest, and almost none reach the part of the track where a trial happens. And a relay runs one direction, while criminal justice loops - a person released from prison to parole supervision can be sent back for a violation, landing first in a jail run by yet another government. Use the relay for the handoffs, not for the volume or the direction of travel.
Worked example
Suppose a burglary is reported in a suburban city of 40,000 people. The city's police department - one of the 11,824 local police departments BJS counted in 2018, and quite possibly one of the 7,055 agencies with fewer than ten full-time-equivalent sworn officers - investigates and arrests a suspect. Its authority ends there. The county prosecutor, whom the city does not employ and cannot instruct, decides what to charge or whether to charge at all. While the case is pending, the defendant is held in the county jail run by the sheriff, joining the 70% of the midyear-2023 jail population that was unconvicted. The case resolves by guilty plea, as the overwhelming majority do. The judge imposes a prison term, so a state department of corrections takes custody; had the sentence been probation, a fourth agency would have supervised it. That is five organizations and four budgets, with no common supervisor anywhere in the sequence.
Key takeaway
Police, courts, and corrections are three separately governed institutions that pass a case along rather than one organization that processes it. The handoffs are where discretion lives, and the separate budgets and separate lines of accountability are why coordination between the components is structurally difficult rather than accidentally poor.
Quick check
3 questions here, of 5 in this lesson’s practice set. Answers stay hidden until you check.
A person is being held in a county facility while awaiting court action on a pending charge. Using the definitions the Bureau of Justice Statistics applies, which description is accurate?
Choose an answer, then check it.
In federal court in fiscal year 2025, approximately what share of individuals sentenced had been convicted at trial rather than by guilty plea?
Choose an answer, then check it.
Study tools & related lessonsYou’ll learn to · Common mistakes · Easily confused · Key vocabulary · Related
You’ll learn to
- Define the police, courts, and corrections components and state the decision each one owns.
- Distinguish municipal police departments, county sheriffs' offices, primary state agencies, and federal law enforcement by scale, number, and jurisdiction.
- Explain the dual state and federal court structure, the difference between trial and appellate levels, and the prosecutor's charging role.
- Distinguish jails, prisons, and community supervision by operating authority, sentence length, and population size, using dated national figures.
- Trace a single case across the handoffs between components and identify where discretion enters at each one.
- Analyze why coordination failures among the three components are structural rather than the result of individual error.
Common mistakes
Treating police, courts, and corrections as three levels of one agency, so that a policy set at the top flows downward.
They are separately constituted, separately funded, and separately accountable. None can direct another; the only authority common to all three is the law itself, which is why BJS describes many individually unique systems rather than one.
Using 'jail' and 'prison' interchangeably.
Jails are local, fast-turnover, and mostly pretrial - 70% of the midyear-2023 jail population was unconvicted, with an average stay of 32 days. Prisons are state or federal and hold longer sentences: 96% of the 1,254,224 people under prison jurisdiction at yearend 2023 were serving more than a year.
Picturing corrections as mainly buildings and cells.
At yearend 2023, 3,772,000 people were supervised in the community on probation or parole against 1,852,900 incarcerated - roughly two under supervision for every one confined. Most correctional contact happens in an office, not a facility.
Assuming criminal cases are normally resolved by trial.
Of 66,662 individuals sentenced in federal court in fiscal year 2025, 97.7% had pleaded guilty and 2.3% were convicted at trial. The Supreme Court in Missouri v. Frye (2012) cited comparable BJS figures for state convictions. Trials are the exception the system is built around, not the ordinary case.
Repeating 'about 18,000 police agencies' as a current fact.
The most recent BJS census counted 17,541 state and local agencies with at least one full-time-equivalent sworn officer as of June 30, 2018. It is a periodic census with a reference date, not a live number, and it should always be quoted with that date.
Easily confused
Municipal police department vs. County sheriff's office
A municipal department is a city agency whose work is almost entirely law enforcement. A sheriff's office is a county agency that commonly runs the county jail and serves the courts as well as patrolling - which is why BJS treats sheriffs' offices with only jail and court duties as a distinct category outside its general-purpose agency counts. In some states, such as California, the sheriff is elected by county voters under the state constitution.
State court system vs. Federal court system
Each state's judiciary applies that state's law and is the final authority on it, and state courts hear most criminal cases. The federal system - 94 district courts, 13 courts of appeals, and the Supreme Court - handles offenses Congress has defined and questions of federal law. Neither is an appellate level of the other in the ordinary sense.
Trial court vs. Appellate court
A trial court takes evidence and decides what happened. An appellate court takes no new evidence and reviews the record for legal error in how the trial court proceeded.
Jail vs. Prison
A jail is locally operated, holds people before and after arraignment and those sentenced to roughly a year or less, and was 70% unconvicted at midyear 2023. A prison is run by a state or the federal government and typically holds people sentenced to more than a year. Six states run integrated systems that erase the distinction.
Institutional corrections vs. Community corrections
Institutional corrections confines a person in a jail or prison. Community corrections supervises a person living at home under conditions set by a court or paroling authority. At yearend 2023 the community side was roughly twice the size of the institutional side.
Key vocabulary
- jurisdiction
- The legal authority of a government, agency, or official to act in a given territory or over a given class of case.
- sworn officer
- An employee granted arrest powers by law, as distinct from civilian staff who support an agency without those powers.
- sheriff's office
- A county-level law enforcement agency that may combine patrol duties with running the county jail and serving the courts; in some states the head of the office is elected by county voters.
- trial court
- The level at which evidence is presented, disputed facts are resolved, and a first judgment in a case is entered.
- appellate court
- A level that reviews the record of a lower court for legal error rather than hearing witnesses or receiving new evidence.
- charging decision
- A prosecutor's choice whether to bring a criminal case at all and, if so, which offenses to allege.
- guilty plea
- A defendant's formal admission in court that resolves a charge without a trial on the merits.
- jail
- A locally administered confinement facility holding people before and after arraignment and those serving sentences of about a year or less.
- prison
- A long-term facility operated by a state or the federal government, typically holding people sentenced to more than one year.
- community corrections
- Supervision of a person living in the community, on probation or parole, by a correctional agency rather than inside a facility.
Sources & references
- Census of State and Local Law Enforcement Agencies, 2018 - Statistical Tables (NCJ 302187) — Bureau of Justice Statistics (BJS), U.S. Department of Justice
- Federal Law Enforcement Officers, 2020 - Statistical Tables (NCJ 304752) — Bureau of Justice Statistics, U.S. Department of Justice
- Sheriffs' Offices, 2016: Personnel (NCJ 252834) — Bureau of Justice Statistics, U.S. Department of Justice
- Comparing Federal and State Courts — Administrative Office of the U.S. Courts
- Prosecutors in State Courts, 2007 - Statistical Tables (NCJ 234211) — Bureau of Justice Statistics, U.S. Department of Justice
- California Constitution, Article XI, Section 1 — California Legislative Counsel (official California Legislative Information)
- Sourcebook of Federal Sentencing Statistics, Fiscal Year 2025, Table 12: Guilty Pleas and Trials by Type of Crime — United States Sentencing Commission
- Bordenkircher v. Hayes, 434 U.S. 357 (1978) — Supreme Court of the United States (United States Reports, via the Library of Congress)
- Missouri v. Frye, 566 U.S. 134 (2012) — Supreme Court of the United States (United States Reports, via the Library of Congress)
- Jail Inmates in 2023 - Statistical Tables (NCJ 309965) — Bureau of Justice Statistics, U.S. Department of Justice
- Prisoners in 2023 - Statistical Tables (NCJ 310197) — Bureau of Justice Statistics, U.S. Department of Justice
- Correctional Populations in the United States, 2023 - Statistical Tables (NCJ 310413) — Bureau of Justice Statistics, U.S. Department of Justice
- The Justice System — Bureau of Justice Statistics, U.S. Department of Justice
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Researched 2026-08-18
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