Whether an inmate number changes after a transfer depends on where the person is being moved. Within the same correctional system, the number stays the same; a state prisoner shifted from one facility to another keeps their ID, and a federal inmate keeps their eight-digit register number no matter how many BOP facilities they pass through. The number changes when someone crosses out of one system into another, such as a state-to-federal transfer, a state-to-state transfer under an interstate compact, or a return to custody after release.
Transfers Inside the Same System
An inmate identification number is tied to the person, not the building. When someone moves from a maximum-security prison to a medium-security facility across the state, their number travels with them. Commissary accounts, phone lists, and other systems families rely on stay linked to that same number.
The federal system works the same way. The Bureau of Prisons assigns an eight-digit register number in the format XXXXX-XXX, where the last three digits identify the federal judicial district the person was processed through.1Federal Bureau of Prisons. Inmate Security Designation and Custody Classification That number does not change when the BOP moves someone between facilities. The SENTRY database keeps records under the register number regardless of how many transfers occur.2U.S. Department of Justice, Federal Bureau of Prisons. Health Information Management Program Statement 6090.04
Transfers Between Different Systems
This is where the number does change, and where families most often get tripped up.
State to Federal
When the U.S. Marshals Service takes custody of someone from a state or local facility to begin a federal sentence, the BOP treats the person as a new commitment and runs its standard intake procedures.1Federal Bureau of Prisons. Inmate Security Designation and Custody Classification A new eight-digit federal register number is assigned. The state ID does not carry over into the federal system, and a federal number does not carry into a state system. The BOP does run a name search through SENTRY at intake to check whether the person was previously confined federally, which links prior federal records to the new commitment, but the working number going forward is the newly assigned one.
State to State
Interstate transfers under agreements like the Interstate Corrections Compact also produce a new number. Each state issues its own identifier, and no state adopts another state’s numbering. To find the person after such a transfer, use the receiving state’s inmate locator; the sending state’s number won’t help you there.
What Happens if Someone Returns to Custody
Release followed by re-incarceration is the other common trigger for a number change. In the federal system, BOP staff run a SENTRY search during intake to determine whether the person already has a register number on file. If there was a break in custody, meaning time spent free between sentences, new commitment procedures apply.1Federal Bureau of Prisons. Inmate Security Designation and Custody Classification State practices vary; some reactivate the original number, others assign a fresh one.
For families, the takeaway is simple: after any re-incarceration, don’t trust an old number. Verify the current one through the relevant system’s inmate locator before sending money or trying to set up phone access.
A Legal Name Change Does Not Change the Number
If the person you’re contacting has legally changed their name while incarcerated, that alone will not trigger a new identification number in any system. The number stays put. What changes is how the name gets used in the facility, and that varies considerably. The most common approach is dual naming, where the commitment name (the name on file at sentencing) remains the primary identifier in official records and the new legal name is added alongside it. Several states require both names to appear on inmate ID cards and outgoing mail. A few states will fully update records to the new name; others refuse to update the name at all, even with a court order. Replacement ID cards are typically issued at the inmate’s expense, with fees generally between $2 and $25.
Until the facility confirms otherwise, keep using the commitment name and the same ID number for mail, deposits, and phone registration.
What a Changed Number Affects
A new number is not just a paperwork detail. It touches most of the ways families stay in contact.
Money and Commissary
Sending money to a federal inmate through Western Union requires the eight-digit register number combined with the person’s last name, with no spaces or dashes.3Federal Bureau of Prisons. Sending Funds Using Western Union An old or wrong number means the deposit doesn’t reach the account. When someone receives a new number after crossing systems, any balance held under the old number in the previous system has to be resolved by that facility’s records office, and the receiving facility opens a new commissary account under the new number.
Phone and Visitation
Phone systems generally tie approved calling lists to the inmate’s ID number. When the number changes, family members may need to re-register their phone numbers under the new identifier. Visitation lists usually transfer automatically within the same correctional system when someone moves between facilities. A transfer to a different system, or re-admission after release, typically means starting the visitation approval process from scratch.
Medical Records
In the federal system, health records are maintained permanently under the register number, no matter how many times the person is admitted or transferred. When a federal inmate moves to another BOP facility, an exit health summary and the full paper health record travel with them, and if anything goes missing in transit, the receiving facility uses SENTRY to identify every prior institution and locate the files.2U.S. Department of Justice, Federal Bureau of Prisons. Health Information Management Program Statement 6090.04 Transfers to privately operated facilities without access to BOP electronic health records receive a printed copy of the previous year’s medical history.
State systems are less standardized, and a number change during an interstate transfer creates real risk of records falling through the cracks. If the person has ongoing medical needs or prescriptions, confirm that health records actually arrived at the new facility.
If You Suspect the Number Is Wrong
Errors in number assignment happen, usually from data entry mistakes or software glitches at intake. Minor consequences look like a delayed commissary deposit. Serious ones can include incorrect sentence calculations, missed court appearances, or problems at a parole hearing. Biometric verification at intake, including fingerprinting and photographs, is one of the safeguards meant to keep the right number attached to the right person.
If you spot an error, contact the facility’s records office directly, and don’t sit on it. An incorrect number tends to compound the longer it goes unfixed. Federal facilities have formal grievance procedures under 28 CFR Part 40 that provide a structured way to resolve disputes.4eCFR. 28 CFR Part 40 – Standards for Inmate Grievance Procedures
How to Look Up the Current Number
For federal inmates, the BOP operates an online inmate locator at bop.gov/inmateloc that covers everyone incarcerated in the federal system from 1982 to the present.5Federal Bureau of Prisons. Federal Inmates By Number You can search by name, or by number if you already have a register number, DCDC number, FBI number, or INS number. The tool returns the current register number, facility location, and other basic information.
Most state departments of corrections offer similar search tools, typically searchable by name and date of birth. After an interstate transfer, search the receiving state’s locator, since the original state number won’t apply in the new system. When something doesn’t match up, calling the receiving facility’s records office directly is the most reliable way to confirm the current identification number.