A PID number in jail is the unique Person ID that a correctional facility assigns someone at booking, and it stays attached to that person throughout their time in the system. In facilities that use the term, PID stands for Person ID and can be up to seven digits long.1Kentucky Department of Corrections. Kentucky Online Offender Lookup – Definitions If you need it to send money, set up phone calls, or schedule a visit, you can usually get it in a few minutes through an online inmate lookup or a quick call to the facility’s booking desk.
What a PID Number Is
When someone is booked into a jail or prison, intake generates a number that becomes their identity inside that system. Names alone are unreliable: two people named James Smith can sit in the same housing unit, but their PID numbers are never the same. Staff, vendors, and family use the number to make sure money, mail, and services reach the right person.
The PID gets attached to the person’s housing assignment, medical records, commissary account, disciplinary history, and release date. It functions as the facility’s internal identifier that links everything about that person together. Once assigned, it generally travels with them for as long as they remain in that system’s jurisdiction, including transfers between facilities run by the same agency.
Your Facility Might Call It Something Else
“PID” is not a universal label. The same concept goes by different names depending on who runs the facility, and that’s where a lot of people get stuck on the phone. If you ask a county jail for a “PID number” and the clerk pauses, they almost certainly call it something else.
- DOC number. Used by many state departments of corrections, typically six or seven digits, sometimes with a letter prefix. This is the most common label at the state prison level.
- Register number. The federal Bureau of Prisons uses this term. It follows a five-digit, dash, three-digit format (for example, 12345-678).2Federal Bureau of Prisons. Find an Inmate
- Inmate number or jail ID. County jails and local lockups tend to use these simpler labels.
- Offender ID. Some state systems use this interchangeably with PID.1Kentucky Department of Corrections. Kentucky Online Offender Lookup – Definitions
The function is identical no matter what it’s called. When you’re not sure which term applies, ask for “the inmate’s identification number.” Facility staff and vendor support lines understand that phrasing regardless of what their own system labels it.
How to Find Someone’s PID Number
If you don’t already have the number, start with the easiest source and work down the list.
Online Inmate Search Portals
Most state departments of corrections and many county jails run free online lookup tools. Search for your state’s department of corrections website and look for an “offender search” or “inmate lookup” link. These usually return the person’s identification number, current facility, charges, and sometimes a projected release date. For federal custody, the Bureau of Prisons locator at bop.gov lets you search by name or register number.2Federal Bureau of Prisons. Find an Inmate
VINE (vinelink.com) is a national notification network that can confirm whether someone is in custody and where. It’s designed primarily for crime victims but is open to anyone. VINE may not display the identification number itself, but once you know the facility you can call that facility directly for it.
Calling the Facility
For county jails without a polished online tool, a call to the main line or booking desk is often faster than searching. Have the person’s full legal name and date of birth ready. Staff handle these calls constantly and can usually read the number back in under a minute. If you don’t know which facility is holding someone, start with the county jail in the jurisdiction where they were arrested.
Booking Paperwork or the Person Themselves
The identification number appears on the paperwork generated at intake. If the incarcerated person can tell you their number during a call or visit, that’s the simplest path. Family members who were present at or just after the arrest sometimes have paperwork that includes it.
The Defense Attorney
If online tools aren’t returning results yet and the facility isn’t answering, the person’s defense attorney will have the number in their case file. This matters most in the first day or two after an arrest, before someone appears in public lookup systems.
Why You Need the Number
Almost anything you want to do for someone in custody requires their identification number. Facility systems and third-party vendors are built around it, not around names.
- Depositing commissary money. Whether you deposit online, by phone, or by money order, the vendor needs the person’s full committed name and their identification number. The federal system is explicit: funds that arrive without a valid register number or with an incorrect name won’t post.3Federal Bureau of Prisons. Sending Funds Using the United States Postal Service
- Phone calls and video visits. Setting up a prepaid account with a communications provider requires adding the incarcerated person as a contact using their facility and ID number.
- Scheduling in-person visits. Most facilities use online scheduling that asks you to look the person up by name or ID before booking a slot.
- Sending mail. Every envelope should carry the person’s full legal name and their identification number. Mail without it can be delayed or returned.
PID Number vs. Booking Number vs. SID and UCN
Correctional systems generate several numbers for the same person, and they aren’t interchangeable.
A booking number is tied to a specific arrest event, not to the person. Someone arrested on Monday gets a booking number for that arrest. If they bond out and are arrested again six months later, they get a new one. Courts and jails use it to track people through intake, and it appears on arrest records, but it isn’t always the number vendors want for commissary or phone service.
A PID, DOC number, or inmate number is tied to the person within a particular correctional system and persists across transfers and even multiple arrests within that system’s jurisdiction. This is the number you need for day-to-day services.
A State Identification Number (SID) is assigned by a state’s central criminal records repository and links fingerprint-based criminal history across jurisdictions within that state. The FBI Universal Control Number (UCN) does the same thing at the national level through the FBI’s Next Generation Identification system. Both are law enforcement and court tools, not something family members use to send money or schedule a visit.
What Happens When Someone Transfers
Transfers are where identification numbers get confusing. Within a single state prison system, a person generally keeps their DOC number when moving between facilities. The whole point of a system-wide identifier is that it travels with them.
A move between different systems is a different story. The common path looks like this: someone is arrested and held in a county jail under a local inmate number, then sentenced to state prison and given a state DOC number. Those are two different numbers from two different databases. If that person later enters federal custody, they get a federal register number on top of that. Each system runs its own records.
After any transfer, verify the current number before you try to deposit money or set up a call. The old number from the previous facility won’t work in the new system. The fastest confirmation is a search on the receiving facility’s lookup tool, or a direct call to that facility.