How to Find Someone in Jail or Prison
There is no single national database of everyone behind bars. County jails, state prisons, the federal system, and immigration detention are four separate worlds, each with its own search tool, so the first real step is knowing which one is holding the person you are looking for. This guide maps every public inmate locator, shows you how to search by name or inmate number, explains what a record will and will not tell you, and covers the harder case the free tools cannot solve: finding someone after they have been released. Throughout, the only reason to run a search is a lawful one, such as family contact, serving a defendant, or a legal matter.
The Short Version
To find someone in custody, you first have to know which system holds them, because there is no one database for all of them. If they were arrested locally or are awaiting trial, look at the county sheriff’s online jail roster for the county where the arrest happened. If they were convicted of a felony and sentenced to more than a year, use that state’s Department of Corrections offender lookup. If the charge was federal, use the Federal Bureau of Prisons Inmate Locator at bop.gov, which covers anyone held federally from 1982 to the present. If the person is held by immigration authorities, use the ICE Online Detainee Locator System. You can search most of these by name or by an inmate, booking, or register number. Newly arrested people can take a day or more to appear, and transfers can make someone briefly vanish from a search. The one case the free tools cannot solve is a person who has already been released, since the record then only confirms they left that system. That released-person locate is where a public-records research firm comes in, and we can usually turn one around within 24 hours.
Watch: The Inmate-Locator Map
Which system holds the person, and how to search it.
Watch Overview
One Search Tool Per System
Not one database for all. Four worlds, four lookups.
The single fact that trips most people up is this: there is no master list of everyone incarcerated in the United States. Custody is run at three levels of government plus a separate immigration track, and each one keeps its own records in its own tool. A county jail is run by the county sheriff. A state prison is run by that state’s Department of Corrections. A federal prison is run by the U.S. Bureau of Prisons. Immigration detention is run by Immigration and Customs Enforcement. If you search the wrong one, you will find nothing, and an empty result does not mean the person is free, it usually means you looked in the wrong place.
So the first move is not to search at all. It is to figure out who has custody. The charge tells you most of what you need. A local arrest, a misdemeanor, or someone awaiting trial points to the county jail. A felony conviction with a sentence over one year points to the state prison system. A federal charge, anything prosecuted in federal court, points to the Bureau of Prisons. An immigration hold points to ICE detention. Once you have the right level, the search itself is usually quick and free.
When you are not sure which level applies, do not guess blindly. Where the arrest happened and what the person was charged with are the two best clues, and a single nationwide victim-notification tool, described further below, can help you sweep many county and state systems at once when the jurisdiction is genuinely unknown. The sections that follow walk each tool one at a time.
Who Runs It, Who It Holds, Where to Look
The four custody systems side by side.
| System | Who Runs It | Who It Holds | Where to Search |
|---|---|---|---|
| County Jail | The county sheriff (or local jail authority). | People just arrested, those awaiting trial, and people serving short sentences, usually under one year. | The sheriff’s online jail roster or “who’s in jail” / inmate search for that county. |
| State Prison | The state Department of Corrections (DOC). | People convicted of felonies and sentenced to more than one year. | That state’s DOC offender lookup, one per state. |
| Federal Prison | The U.S. Federal Bureau of Prisons (BOP). | People convicted of federal crimes, held federally from 1982 to the present. | The BOP Inmate Locator at bop.gov, by name or register number. |
| Immigration Detention | U.S. Immigration and Customs Enforcement (ICE). | People held on immigration matters, separate from criminal custody. | The ICE Online Detainee Locator System, by A-number or name. |
Read the table top to bottom and the logic becomes clear: the more serious or federal the matter, the higher up the ladder custody moves, and the more standardized the search tool becomes. County jail rosters are the most variable, since every sheriff builds their own. The federal locator is the most uniform. Knowing which row you are on saves hours of dead-end searching.
County Jail: The Sheriff’s Roster
Where almost every search starts, and the most variable.
Most searches begin at the county level, because most people in custody at any given moment are in a county jail rather than a prison. County jails are operated by the county sheriff and hold a mix of people: those who were just booked, those awaiting trial because they have not posted bail, and people serving short sentences, typically under one year. Because the sheriff runs the facility, the search tool lives on the sheriff’s website, usually labeled something like “jail roster,” “who’s in custody,” or “inmate search.”
The catch is that there is no standard. Some sheriffs post a full, searchable roster with booking photos, charges, and bail amounts. Others publish a bare daily list, and a few small counties still require a phone call to the jail. You generally search by last name, sometimes with a first name or a booking number to narrow it down. Because the right county is everything here, start with where the arrest occurred. If the person was picked up in a city, that city usually sits in a specific county, and the county sheriff, not the city police, typically runs the jail.
One more county-level reality: people move through jails fast. Someone booked overnight may be released on bail or transferred before a roster updates, so a jail roster is a snapshot, not a guarantee. If you find the person but the information looks thin, calling the jail’s records line to confirm a facility and a booking number is a reasonable next step before you rely on it for anything.
State Prison and Federal Prison
Two different lookups for two different governments.
When someone has been convicted of a felony and sentenced to more than a year, they move from a county jail into a prison. Which prison system depends on who prosecuted the case. State charges send a person into that state’s Department of Corrections; federal charges send them into the Bureau of Prisons. The two systems do not share a public search tool, so you have to know which government had the case.
State Department of Corrections lookups
Every state runs its own offender locator through its Department of Corrections. These are generally more polished than county rosters: you can usually search by name or by the state’s inmate identification number, and many states show the assigned facility, custody status, a photo, and an estimated release date. The estimate is exactly that, an estimate, because good-time credits, parole decisions, and re-sentencing can move the date. If you do not know which state holds the person, you have to check states individually, which is one of the moments the nationwide victim-notification tool described below earns its keep.
The Federal Bureau of Prisons locator
For federal cases, the Bureau of Prisons runs a single national tool, the BOP Inmate Locator, which can find anyone held in federal custody from 1982 to the present. You can search by the person’s name, or, far more precisely, by a number, including the BOP register number, an FBI number, or older INS or DCDC numbers. A name search returns matches showing name, age, race, sex, the housing location, and a release date, and the data is pulled from the BOP’s main database and refreshed daily. One thing the federal locator does not provide is a public booking photo, so if a site is showing you a federal “mugshot,” it is a third-party aggregator, not the BOP, and aggregators are exactly where stale and wrong information lives.
Immigration Detention and the Nationwide Sweep
The ICE locator, and VINE when you do not know the jurisdiction.
ICE detention is its own track
Someone held by Immigration and Customs Enforcement is not in the criminal-custody system at all, so the jail and prison tools will not find them. ICE runs a separate public tool, the Online Detainee Locator System, built for family members and legal representatives to find an adult in immigration detention. You can search two ways: by the person’s A-number, the eight or nine digit Alien Registration Number that appears on Department of Homeland Security correspondence, together with their country of birth; or by full name, date of birth, and country of birth. The system does an exact match, so a name has to be entered just as the government recorded it, and you may need to try spelling variations before a record appears.
VINE: the nationwide custody sweep
When you genuinely do not know which state or county holds someone, there is a free service that spans many systems at once. VINE, searched through its public site VINELink, is a nationwide victim-notification and custody-status service that draws from a large share of the country’s county jails and state prison systems, currently covering the great majority of states. You can look up custody status across participating jurisdictions and, separately, register to be notified if a person’s status changes, such as a release or transfer. It is the closest thing to a broad sweep that exists, but it has real edges: it does not participate in every state, and it does not track federal Bureau of Prisons inmates, who fall under a separate federal victim-notification system. Treat VINE as a powerful way to narrow down a jurisdiction, then confirm the detail in the specific county, state, or federal tool that owns the record.
What a Record Shows and What It Doesn’t
Read the result correctly, including its limits.
A custody record is a confirmation, not a dossier. When a locator finds someone, you can typically expect the facility where they are held, a custody status, an inmate, booking, or register number, and, depending on the system, a booking photo and an estimated release date. That is usually enough to do the lawful things people actually need: arrange a visit, send mail, set up a phone or commissary account, or confirm where a process server or attorney can reach an incarcerated party.
What these tools deliberately do not show is just as important. Release dates are projections that shift with credits and parole. Juvenile records are generally not public, and sealed or expunged cases will not appear at all, which is by design and which we respect. The immigration locator is built to confirm that someone is in ICE custody and where, not to explain the specifics of their case. And critically, once a person has been released, the record stops being a location, it becomes only a confirmation that they left that system, with no forwarding address attached. That released-person gap is the single most common reason people stop finding answers in the free tools.
What Makes an Inmate Search Come Back Empty
The usual reasons a real person does not show up.
Booking Lag
Someone just arrested can take many hours, sometimes a day or more, to appear on a roster while booking is processed.
Mid-Transfer
A person moving from jail to prison, or between facilities, can briefly disappear from every search until the new system logs them.
Wrong System
Searching a county roster for a federal inmate, or a state lookup for an ICE detainee, returns nothing even though the person is in custody.
Common Name, No Number
A name like John Smith returns a wall of near-matches. A date of birth or an inmate number is what cuts through it.
Spelling Mismatch
Exact-match tools, like the ICE locator, only return a hit if the name is entered exactly as the agency recorded it.
Already Released
The biggest one. If the person is out, the record only confirms they left, and no free tool gives you where they went.
In Custody or Released, How We Find Them
What a public-records research firm does the free tools cannot.
Tell Us What You Know
A name, date of birth, last known location, the charge if you have it, or any inmate, booking, or register number narrows the search fast.
We Identify the System
We work out whether a county jail, a state DOC, the federal BOP, or ICE is the right place, and check the correct public records.
We Confirm or Trace Forward
If they are in custody, we confirm the facility and status. If they have been released, we trace their current location through public records and licensed databases.
You Get a Verified Answer
A confirmed facility for visitation, mail, or service, or a current address for a released person, delivered for a lawful purpose.
Where a Professional Genuinely Helps
The free tools are good. Here is where they run out.
For most in-custody questions, the public locators are all you need, and we will tell you so. A name in the right county roster or a register number at bop.gov often answers the question in minutes, for free. We are a public-records research firm, not a service that charges you for a search you could run yourself. The value of bringing us in shows up in three specific situations.
The first is when you do not know which system holds the person and checking fifty state lookups plus a county roster by hand is not realistic. We know the map and check the right records efficiently. The second is the common-name problem: when a search returns hundreds of near-matches, we use additional identifiers and public records to confirm which one is actually your subject, rather than guessing. The third, and the one no free tool solves, is a person who has been released. The custody record becomes a historical anchor, a confirmed point in time and place, and from there we trace forward to a current address through public records and licensed databases, the same skip tracing work we do on any locate. It is also where this page connects to our guides on finding a party to serve papers and locating someone in the military, and to a statewide locate in a place like Texas, since a released person is, in the end, just a person to be found. For a legitimate matter, a locate typically comes back within 24 hours.
The Lawful-Purpose Line We Hold
What we will, and will not, do with a custody search.
Knowing where someone is held carries real responsibility, and incarceration searches raise it sharply, because the person in custody may be there in connection with the very person doing the searching. We are a public-records research firm working under permissible-purpose rules, including the Fair Credit Reporting Act, GLBA, and DPPA. We are not a law firm, we are not licensed private investigators, and we are not a bail bondsman. We locate people, including confirming whether and where someone is incarcerated, for lawful reasons such as family contact, serving a defendant, or a legal or bond matter.
What we will not do is enable harm. We do not facilitate harassment or witness intimidation, and we will not help anyone make contact that violates a no-contact order, a protective order, or a victim’s expressed wishes. If a custody search looks like it would endanger a victim or breach a court order, we decline it. We also respect that some records are sealed, juvenile, or expunged, and we do not try to reach behind those protections. This page is general information, not legal advice; for the rules in a specific case, talk to an attorney.
Who We Help
Lawful reasons people need to find someone in custody.
Families
Locate a relative for visits and mail
Attorneys
Reach an incarcerated client or party
Process Servers
Confirm a facility to serve a defendant
Bail / Bond
Verify custody for a bond matter
Released-Person Locate
Trace forward after release
Legal Matters
Confirm status for a court case
Our Commitment
We confirm whether and where someone is in custody, or trace a released person to a current location, through public corrections records and licensed databases, for a lawful, permissible purpose only. Careful, court-aware locating since 2004, with a verified answer typically back within 24 hours.
Frequently Asked Questions
Is there one national database to find anyone in jail or prison?
No. County jails, state prisons, the federal Bureau of Prisons, and ICE detention are four separate systems, each with its own search tool. An empty result usually means you searched the wrong system, not that the person is free. The first step is figuring out which level of government has custody.
How do I find someone in a county jail?
Use the online jail roster, often called “who’s in custody” or “inmate search,” on the website of the sheriff for the county where the arrest happened. County rosters vary widely, so search by last name and confirm with a booking number or a call to the jail records line if the listing looks thin.
How does the federal Bureau of Prisons locator work?
The BOP Inmate Locator at bop.gov finds anyone held in federal custody from 1982 to the present. You can search by name or, more precisely, by a register, FBI, or older INS number. Results show name, age, sex, location, and a release date, and the data is refreshed daily. The BOP does not provide public booking photos.
How do I find someone in immigration detention?
Use the ICE Online Detainee Locator System. You can search by the person’s A-number plus country of birth, or by full name, date of birth, and country of birth. It performs an exact-name match, so enter the name exactly as the government recorded it and try spelling variations if nothing appears.
What is VINE and when should I use it?
VINE, searched through VINELink, is a nationwide victim-notification and custody-status service covering a large majority of county jails and state prison systems. Use it to sweep across jurisdictions when you do not know where someone is held, then confirm in the specific tool. It does not cover every state and does not track federal Bureau of Prisons inmates.
Why does someone not show up even though they were arrested?
Booking can take many hours, so a newly arrested person may not appear right away. Someone being transferred between facilities can briefly vanish from every search. You may also be searching the wrong system, or a common name without a date of birth or inmate number is buried in near-matches.
What does a custody record show, and what does it not?
It typically shows the facility, custody status, an inmate or register number, sometimes a photo, and an estimated release date that can change. It does not show sealed, juvenile, or expunged records, and once someone is released it only confirms they left that system, with no current address attached.
Can you find someone after they have been released?
Yes, and that is the case the free tools cannot solve. We use the custody record as a confirmed point in time, then trace forward to a current location through public records and licensed databases, for a lawful purpose only. A locate typically comes back within 24 hours. We will not help with contact that violates a no-contact or protective order.
Need to Confirm Custody or Find a Released Person?
As a public-records research firm, we identify the right system, confirm where someone is held, or trace a released person to a current location, lawfully and typically within 24 hours. Contact us to get started.
Start Your Request →
