Jail vs Prison: What's the Difference?
Jails are local facilities — typically run by a county sheriff or city — used for short-term detention: people awaiting trial, awaiting sentencing, or serving sentences under one year. Prisons are state or federal facilities for people convicted of serious crimes serving sentences longer than one year. The key split: jails are local and temporary; prisons are state/federal and long-term.
In movies and everyday speech, "jail" and "prison" are used interchangeably — but in the US legal system, they are distinct institutions with different purposes, populations, and administrative structures. The distinction matters if you're involved in the legal system or simply want to understand how incarceration works. The same distinction applies in the UK (remand prison vs sentenced prison) and most other common-law countries, though terminology differs.
Key Differences at a Glance
| Feature | Jail | Prison |
|---|---|---|
| Who runs it? | Local government (county sheriff, city) | State or federal government |
| Sentence length | Usually under 1 year (or pre-trial) | Usually 1 year or more |
| Population includes | Pre-trial detainees, misdemeanour convicts | Convicted felons serving long sentences |
| Programmes offered | Limited — short stays make it impractical | Education, vocational, rehab programmes |
| Security levels | Usually single level | Minimum to maximum (supermax) |
| US count (approx) | ~3,000 jails | ~1,800 state + federal prisons |
Jails: Local, Short-Term, High Turnover
A jail is a local facility — typically operated by a county sheriff or city police department — designed for short-term confinement. Jails hold two main populations: people who have been arrested and are awaiting trial (pretrial detainees, who have not yet been convicted of anything), and people who have been convicted of misdemeanours and sentenced to terms typically under one year. Because populations change rapidly — people arrive, are bailed out, go to court, are sentenced, and move on — jails have enormous turnover. The US processes roughly 10 million jail admissions per year. Programming (education, treatment, vocational training) is often limited because stays are short and unpredictable.
Prisons: State or Federal, Long-Term
A prison is a state or federal facility for people convicted of felonies (serious crimes) who are serving sentences longer than one year. State prisons house people convicted of state crimes (murder, robbery, drug offences, etc.); federal prisons house people convicted of federal offences (federal drug trafficking, fraud, terrorism, etc.). Prisons are categorised by security level: minimum security (low-risk offenders, often farm or camp settings), medium security, maximum security, and supermax (most dangerous, extreme isolation). Because sentences are long and populations are more stable, prisons can and often do offer educational programmes, vocational training, and rehabilitation services.
Outside the US
In the UK, the distinction is different: "prison" covers all custodial facilities, but there are remand prisons (for people awaiting trial, equivalent to US jails) and sentenced prisons. Young Offender Institutions and Secure Training Centres handle under-18s separately. In everyday UK speech, "jail" and "prison" are fully interchangeable — neither has the technical meaning it holds in the US. Australia and Canada use similar terminology to the UK, with "gaol" (old spelling of jail) appearing in some older statutes.
Frequently Asked Questions
Can you be held in jail without being convicted?
Yes. Pretrial detention — being held in jail before trial — is common for people who cannot make bail, who are considered a flight risk, or whose offence is not bailable. Pretrial detainees are legally innocent (not yet convicted) but are confined while the legal process proceeds.
What is a federal prison vs a state prison?
State prisons hold people convicted of violating state laws (most violent crimes, most drug offences). Federal prisons hold people convicted of violating federal law — crimes investigated by the FBI, DEA, or other federal agencies. Federal facilities are run by the Bureau of Prisons (BOP); state facilities are run by state departments of corrections.
What is a remand centre?
A remand centre (used in the UK, Canada, and Australia) holds people awaiting trial — equivalent to a pretrial jail in the US. Being "on remand" means being detained before your trial or sentencing. Time spent on remand is usually credited against any eventual sentence.
How We Write These Comparisons
SmartAss Facts comparisons are written to be the clearest, most accurate answer to "what is the difference between X and Y?" on the internet. We start from the primary definition — taxonomic, scientific, or linguistic — and work outward to the practical distinctions most people actually need.
Each comparison table row is independently sourced. If a distinction is more nuanced than a table cell allows, the detail appears in the body sections below the table. If you find an error or a meaningful distinction we have omitted, the comparison index includes contact information. Last reviewed: 2026-05-25.
More Comparisons
Often confused, always distinct. Every comparison below is backed by clear criteria.