In American English, jail and prison usually refer to different levels of detention. A jail is generally a local facility that holds people awaiting trial or serving shorter sentences. A prison is typically a state or federal facility for people serving longer sentences after conviction.
Other countries use different terminology, so this distinction should not be applied universally.
At a glance
| Point | Jail | Prison |
|---|---|---|
| Typical authority | County/municipal/local | State or federal |
| Pretrial detainees | Common | Less typical |
| Sentence length | Generally shorter sentences | Longer sentences |
| Population turnover | High | Lower turnover relative to jails |
| Programs/security | Varies; often designed for shorter stays | Broader long-term custody programs and security classifications |
Jail
A local detention facility commonly run by a county/city, housing pretrial detainees and people serving relatively short sentences.
Prison
A state or federal correctional institution primarily holding people serving sentences after conviction.
Pretrial does not mean guilty
Many people in jail have not been convicted of the charge for which they are being detained. They may be awaiting bail resolution, trial or another court decision.
This distinction matters when describing someone’s legal status.
Terminology outside the US
Countries use terms such as remand centre, detention centre, correctional centre, gaol/jail and prison differently. South Africa, the UK, Australia and other systems do not map perfectly onto the US jail/prison distinction.
Local rules vary
Some US jurisdictions house people with longer sentences in local facilities, and state systems can use county contracts. The basic comparison is useful, but exceptions are common.
Important note
Criminal-justice terminology is jurisdiction-specific.
Frequently asked questions
Can someone be in jail for months without conviction?
Yes, pretrial detention can last much longer than the everyday meaning of ‘short-term’.
Can prisons hold people awaiting trial?
The usual distinction says no, but transfers and specialized arrangements can create exceptions.
Is jail less secure than prison?
Not necessarily. Security level depends on the facility and population.
Does this distinction apply worldwide?
No.
Sources and further reading
KnowDifferences Editorial Team
Independent explanations with definitions, practical examples and references. Read our editorial approach.