The difference between jail and prison comes down to who runs the facility, who’s held there, and for how long. Jails are run by local governments, typically a county sheriff, and hold two groups: people awaiting trial and people serving short sentences of roughly one year or less. Prisons are run by state departments of corrections or the federal Bureau of Prisons, and they hold people who have already been convicted and sentenced to more than a year. That one-year line is the practical dividing point between the two systems.
Who Runs Each Type of Facility
Local jails answer to county sheriffs or municipal police departments. The sheriff is usually elected and controls the jail’s budget, staffing, and daily operations. Because jails answer to local government, conditions and resources vary heavily from county to county.
State prisons are managed by each state’s department of corrections, which reports to the governor. These agencies run networks of facilities at different security levels across the state.
Federal prisons fall under the Bureau of Prisons, which operates under the Attorney General and oversees all federal penal and correctional institutions.1Office of the Law Revision Counsel. 18 USC 4042 – Duties of Bureau of Prisons A separate agency, the U.S. Marshals Service, takes custody of everyone charged with a federal offense from the moment a court orders detention until they are acquitted or delivered to prison to serve a sentence.2U.S. Marshals Service. Custody of Prisoners The Marshals Service does not run large detention facilities of its own, so it contracts with local jails to house many federal pretrial detainees. That’s one reason a federal defendant can sit in a county jail for months before ever seeing the inside of a federal prison.
Who Is Actually Inside
Jail populations look very different from prison populations. At midyear 2023, 70% of people in local jails had not been convicted of anything. They were awaiting court action on a current charge or being held for other reasons.3Bureau of Justice Statistics. Jail Inmates in 2023 – Statistical Tables These are people who couldn’t post bail, were denied bail, or hadn’t yet had a hearing. The remaining 30% were serving sentences or awaiting sentencing after conviction.
Prisons hold a single legal category: people who have already been convicted and received a sentence of more than one year. Once sentencing happens, the person transfers from local custody to state or federal prison, and their status shifts from pretrial detainee to sentenced prisoner.
How the Crime Determines Where You Go
The seriousness of the offense drives the destination. Misdemeanors, the less serious category, tend to produce jail time or no incarceration at all. Felonies produce prison sentences.
Federal law sorts offenses on a graded scale. Under 18 USC 3559, the dividing line between the most serious misdemeanor (up to one year) and the least serious felony (more than one year but less than five) sits exactly at one year, matching the line between jail-level and prison-level sentences.4Office of the Law Revision Counsel. 18 USC 3559 – Sentencing Classification of Offenses
Whether the case lands in the federal or state system depends on the charge itself. Offenses that cross state lines, violate federal statutes, or occur on federal property go federal. Everything else is handled by the state where the crime happened, and each state has its own classification and sentencing rules.
How the Facilities Are Built and Run
Prisons sort inmates by risk, and the physical design reflects that sorting. The Bureau of Prisons uses five security classifications: minimum, low, medium, high, and administrative.5Federal Bureau of Prisons. Inmate Security Designation and Custody Classification Placement depends on a scoring system weighing offense severity, criminal history, time remaining on the sentence, and any history of violence or escape. Management overrides can adjust the level when circumstances warrant.
Minimum-security facilities often use dormitory-style housing with limited perimeter security. High-security facilities use reinforced concrete, heavy surveillance, and tight restrictions on movement. Administrative facilities handle specialized functions like medical care, pretrial holding, or mental health treatment and can house inmates across all security levels. State systems use similar tiered approaches with their own labels.
Jails are built for turnover, not long-term housing. A large urban jail may process hundreds of new arrivals every day, each needing booking, a health screening, a court appearance, and eventual release or transfer. The layout prioritizes efficient movement: holding cells for intake, communal pods for people staying weeks or months, and direct routes to courtrooms and medical units.
Programs, Work, and Education
Prisons invest more in long-term programming because sentences run for years. Federal vocational training covers trades like welding, cabinetry, electronics, and computer-aided drafting. UNICOR, the federal prison industries program, employs inmates across sectors from furniture manufacturing to data entry, paying between $0.23 and $1.15 per hour.6Federal Bureau of Prisons. UNICOR Earning above the entry-level pay grade requires a high school diploma or GED. State prison wages range from nothing at all to around $2.00 per hour depending on the state and the job.
Prison education typically includes GED preparation and, increasingly, college-level courses through partnerships with accredited institutions. Many prisons also run work-release programs allowing eligible inmates to hold outside jobs while remaining under supervision.
Jails offer far less because most people aren’t there long enough to complete a multi-week program. Jail services focus on stabilization: health screenings, emergency dental care, short-term substance abuse counseling, and basic mental health interventions. Administrative energy goes to managing constant intake and release rather than building a rehabilitation pipeline.
Visits and Phone Calls
In the federal system, every inmate is entitled to at least four hours of visiting time per month, though most facilities provide more.7Federal Bureau of Prisons. How to Visit a Federal Inmate Visiting hours usually fall on weekends and holidays. Visitors must be pre-approved and cleared through a background check. Brief physical contact like a handshake or hug is allowed at the start and end of a visit; conjugal visits are not permitted in federal facilities. Local jails set their own visitation policies, and many have shifted heavily toward video-only visits.
Phone call rates are now capped by the FCC. The full caps take effect April 6, 2026. Calls from prisons are capped at $0.11 per minute for audio and $0.25 for video. Jail rates depend on the facility’s size: large jails with more than 1,000 inmates face a $0.10 audio cap, while the smallest jails with fewer than 50 inmates can charge up to $0.19 per minute.8Federal Communications Commission. Incarcerated Peoples Communications Services Providers can no longer add automated payment fees or third-party transaction charges, though international calls may still carry additional per-minute costs.
What It Costs to Be Inside
Commissary stores in prisons and jails sell snacks, hygiene products, and basics at markups commonly running 25% to several hundred percent above retail. For inmates earning cents per hour, a tube of toothpaste can represent a full day’s wages, and family members often deposit money into commissary accounts to close the gap.
Some local jails charge inmates a daily fee for room and board, typically $20 to $80 per day. These fees accrue as debt that follows the person after release, though enforcement varies. Federal inmates in the Inmate Financial Responsibility Program are encouraged to direct part of their earnings toward court-ordered restitution and fines. Participation is technically voluntary, but declining can affect housing assignments, commissary spending limits, and other privileges.
Rights That Apply in Both
Being locked up does not erase constitutional protections, though it narrows them. Three areas matter most.
Medical Care
The Eighth Amendment requires correctional facilities to provide adequate medical care. The Supreme Court held in 1976 that deliberate indifference to a prisoner’s serious medical needs is unconstitutional punishment. That doesn’t mean inmates get to pick their care. It means officials who know about a serious medical condition and consciously disregard it are violating the Constitution. Delayed treatment, denied prescribed medication, and ignored symptoms of acute illness are the kinds of conduct that cross the line.
Religious Exercise
The Religious Land Use and Institutionalized Persons Act bars any government-run facility from imposing a substantial burden on an inmate’s religious exercise unless the facility can show the restriction serves a compelling interest and uses the least restrictive means possible.9Office of the Law Revision Counsel. 42 USC 2000cc-1 – Protection of Religious Exercise of Institutionalized Persons This covers dietary requirements, worship schedules, and grooming standards tied to religious belief. The government bears the burden of justifying any restriction.
Filing Complaints and Lawsuits
Inmates who want to challenge conditions in federal court must first exhaust every administrative remedy available inside the facility before filing suit.10Office of the Law Revision Counsel. 42 USC 1997e – Suits by Prisoners That means filing a formal grievance through the internal complaint system and appealing through each level of review. Grievance procedures impose strict deadlines, and missing one can permanently bar a lawsuit, even if the underlying complaint is legitimate. This applies to claims about conditions, excessive force, and civil rights violations alike.
Getting Out Earlier
Federal law provides two main mechanisms for reducing time, and they stack. Good conduct time lets federal inmates serving more than one year earn up to 54 days of credit per year of their sentence. The Bureau of Prisons decides whether the inmate showed exemplary compliance during each period and considers whether the person has earned or is working toward a GED or high school diploma.11Office of the Law Revision Counsel. 18 USC 3624 – Release of a Prisoner Credit not earned during a given period cannot be awarded retroactively.
The First Step Act of 2018 added a second path. Inmates who successfully participate in recidivism-reduction programs or productive activities earn 10 days of credit per 30 days of participation. Those assessed at minimum or low risk who hold that level across two consecutive assessments earn an additional 5 days per 30-day period.12Office of the Law Revision Counsel. 18 USC 3632 – Development of Risk and Needs Assessment System These credits apply toward early transfer to home confinement, a residential reentry center, or supervised release. Inmates with certain disqualifying convictions or a final deportation order cannot apply earned credits regardless of participation. The Bureau calculates good conduct time first, then layers First Step Act credits on top. State systems have their own good-time and earned-time rules, which vary significantly. None of this applies to jail sentences in the same structured way; short jail sentences are too brief for most of these frameworks to operate.
What Release Looks Like
Leaving prison rarely means freedom without strings. Most people released from federal prison serve a term of supervised release, which functions like parole. Mandatory conditions include staying crime-free, avoiding controlled substances, submitting to drug testing within 15 days of release and periodically after, and cooperating with DNA collection.13Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment Courts can add discretionary conditions tied to the offense. Violating any condition can send the person back to prison.
A felony conviction also triggers a web of lasting restrictions. Federal law bars anyone convicted of a crime punishable by more than one year of imprisonment from possessing firearms or ammunition.14Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Depending on the state, a felony can also block certain professional licenses, public housing, student financial aid, and the right to vote. Some restrictions are permanent; others can be lifted through expungement, pardon, or restoration-of-rights petitions. The specific collateral consequences vary so widely by state that anyone facing this situation should research the rules where they live.
The Bureau of Prisons is required to provide prerelease planning that helps inmates apply for federal and state benefits, obtain identification documents like a Social Security card and driver’s license, and build a reentry plan covering employment, education, health, and finances before release.1Office of the Law Revision Counsel. 18 USC 4042 – Duties of Bureau of Prisons Whether that translates into useful preparation depends heavily on the facility.