How to mail a letter to an inmate at Pack Unit
To write to someone held at Pack Unit, address your envelope to the inmate's full committed name and TDCJ number, Texas Department of Criminal Justice, Pack Unit, PO Box 660400, Dallas, TX 75266-0400. Pack Unit is a TDCJ correctional unit in Grimes County in Navasota, Texas, operated by the Texas Department of Criminal Justice. Under the Texas Department of Criminal Justice (TDCJ)'s rules, personal mail is sent to this central address — not the prison — where it is opened, scanned, and delivered to the inmate as a photocopy.
Inmate mail — Pack Unit
[Inmate's full committed name] [TDCJ number] Texas Department of Criminal Justice Pack Unit PO Box 660400 Dallas, TX 75266-0400
All personal mail for Pack Unit is processed offsite. Put the inmate's full committed name and TDCJ number on the first line so it can be matched and delivered.
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Texas Department of Criminal Justice · Pack UnitPO Box 660400Dallas, TX 75266-0400
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Key facts
- Send mail to Texas Department of Criminal Justice, Pack Unit, PO Box 660400, Dallas, TX 75266-0400 — the central processing center, not the prison.
- All general mail for Texas inmates goes to the TDCJ central processing center in Dallas — not to the unit. Mail sent to the unit’s own address is delayed or returned.
- The envelope must show the inmate’s full committed name, TDCJ number, and unit of assignment, plus your full return address. Mail missing the name or TDCJ number is returned to the sender.
- General mail is opened, inspected, and digitized — the inmate reads a scanned copy on a tablet or is given a printout. Send copies, not originals; scanned mail is not returned.
- Legal, media, and other special correspondence is the exception: send those directly to the inmate’s unit of assignment, not the Dallas processing address.
- A letter can only be handled if the person is correctly identified — double-check the TDCJ number and current unit before you send.
- PostPal prints and mails your letter for you the next business day for $5 — with your return address printed so the inmate can write back, and no printer, envelope, or stamp needed.
How to send your letter
- 1
Confirm the person is still at Pack Unit
Inmates are transferred between facilities without notice. Confirm they are still at Pack Unit — and double-check the TDCJ number — before you mail anything, using the Texas Department of Criminal Justice (TDCJ)'s official inmate locator.
- 2
Address it exactly
First line: the inmate's full committed name and TDCJ number. Then Texas Department of Criminal Justice, Pack Unit, PO Box 660400, Dallas, TX 75266-0400. Add your full first and last name and return address, or the letter is rejected.
- 3
Keep the contents allowed
Plain letter-size paper is safest. Remember it will be opened and scanned, so send copies of photos or documents you are willing to lose. Do not enclose cash, stamps, gift cards, or any object other than paper — prohibited items get the whole letter rejected. Check the mail rules above before adding photos.
- 4
Send it without a printer
Write or upload your letter to PostPal with this address prefilled, and we print, envelope, and mail it via USPS the next business day for $5 — your return address printed so they can reply.
Common questions
How do I address a letter to an inmate at Pack Unit?
Put the inmate's full committed name and TDCJ number on the first line, then Texas Department of Criminal Justice, Pack Unit, PO Box 660400, Dallas, TX 75266-0400. Include your full first and last name and return address on the envelope.
Is mail to Pack Unit opened, read, or scanned?
Yes. Under the Texas Department of Criminal Justice (TDCJ)'s rules, incoming personal mail is opened and scanned at a central processing center offsite, and the inmate receives a photocopy or digital scan rather than your original. Originals are not returned to you.
What can I send to Pack Unit — photos, cards, or books?
Photographs are generally allowed but must not be nude, sexually explicit, or gang-related, and polaroids are typically not accepted. Confirm TDCJ’s current limit on the number per envelope before sending. Books and magazines must be ordered directly from a publisher or approved vendor and are reviewed under TDCJ’s Uniform Offender Correspondence Rules (BP-03.91). They cannot be sent in personal mail.
What can't I mail to Pack Unit?
Do not send: Cash, checks, money orders, gift cards, or postage stamps; Any object other than paper (no polaroids, laminated items, or enclosures); Nude, sexually explicit, or gang-related photos or content; Stickers, glitter, glue, tape, perfume, lipstick, or crayon/marker; Books, magazines, or bound materials sent as personal mail. Prohibited items get the letter rejected or destroyed.
What if the person has been transferred or released?
The letter will not reliably reach them or come back to you. Confirm they are still at Pack Unit before mailing, since the Texas Department of Criminal Justice (TDCJ) moves people without notice.
Can the inmate write back to me?
Yes, if you include a complete return address. Inmates can send outgoing mail, though they may need to cover their own postage. PostPal prints your return address for you.
Sources
Addresses verified August 2026 against official sources. Always confirm on the official site before time-sensitive filings.
See the full Texas inmate mail rules — what you can and can’t send, photos & more →