How to address a letter to an inmate
Inmate address format
The envelope is the first thing the mailroom sees. If the name, ID number, facility address, or return address is off, your message may never get to the person you wrote it for.
PieterPost's U.S. inmate flow turns those checks into fields. You confirm the custody path and address before the letter text takes over.
Address check
Use one official mail source
Most address mistakes happen because people mix official sources. The BOP page, a state DOC page, a county sheriff page, and a Google Maps listing can point to different places.
- • Use BOP for federal custody.
- • Use the state DOC for state prison mail.
- • Use the sheriff or jail page for county jail mail.
- • Use facility mail rules over map listings.
Address block to verify
[Full committed name]
[Facility mailing address]
[Inmate ID or register number]
[City], [STATE] [ZIP code]
United States
Replace every placeholder with the official facility and inmate details. If the facility publishes a different format, use that format.
A plain letter with address placeholders
[Full committed name]
[Facility mailing address]
[Inmate ID or register number]
[City], [STATE] [ZIP code]
United States
Address details people often miss
- • BOP register number: usually written as an eight-digit number like 12345-678.
- • Texas TDCJ number: follow the TDCJ mail instructions for the facility and digital mail route.
- • Pennsylvania DOC number: personal mail routes through Smart Communications rules.
- • County jail booking number: check the sheriff or jail mail page before sending.
Before you continue
- • Use the official correspondence address, not the first address you find on Google Maps.
- • Put the inmate ID or register number where the facility rules ask for it.
- • Use the full committed name. Nicknames belong inside the letter, not the address block.
- • Put your full return address on the envelope and in the letter if the facility expects it.
- • Check whether the facility routes personal mail through a central processing address.
The four lines that matter most
Treat the address block like a checklist. Each line has a job.
Name line
ID line
Facility address
Return address
How to address the letter
- Find the official mail instructions for the custody system.
- Copy the committed name and required ID number.
- Copy the correspondence address exactly.
- Add your return address and review the preview before sending.
Sources
More PieterPost tools
Frequently asked questions
What is the standard inmate address format?
For federal mail, use the full committed name, BOP register number, and facility correspondence address. For state and county facilities, follow that system's ID format and mail address instructions.
Do I need the inmate number?
Usually yes. The exact label changes by system: register number, DOC number, DIN, TDCJ number, booking number, or inmate ID.
Which facility address should I use?
Use the facility's official mail or correspondence address. Visiting addresses, package addresses, money addresses, and central office addresses can be different.
Do I need a return address?
Yes. Put your full name and return address on the envelope unless the official rules say otherwise.
Ready to continue?
Open the U.S. inmate letter flow and fill the address fields before writing, so the envelope is not an afterthought.