Writing a letter to someone in jail or prison can feel overwhelming, especially if you have never done it before. You might worry about saying the wrong thing, addressing the envelope incorrectly, or accidentally including something that gets the letter rejected. This guide walks you through every step so your letter actually reaches the person you care about.

How to Address a Letter to an Inmate

Getting the address format right is the single most important part of mailing a letter to an inmate. If the envelope is addressed incorrectly, the facility will return it or throw it away — and you will never be notified.

Use this exact format on the envelope:

Key details that people often get wrong:

• Use the inmate’s full legal name — not a nickname, not a shortened version. The name must match what the facility has on file.
• Include the inmate or booking number. This is how the mailroom identifies the recipient. Without it, your letter may be returned. You can find this number by searching the facility’s inmate roster online or by calling the jail directly.
• Your return address is required. Most facilities will reject mail that does not include a complete return address. Some also require your full name to be printed clearly.
• Use the facility’s official mailing address, which is sometimes different from the physical or street address. Check the facility’s website or call to confirm.

What You Can Include in Your Letter

Every jail and prison has its own set of mail rules, but the following items are accepted at most facilities across the United States:

• Handwritten or typed letters on plain white paper (some facilities require white paper only)
• Photographs — most facilities allow standard-size printed photos (4×6 or 5×7). Photos must not be Polaroids, and some facilities limit the number per envelope (usually 3 to 5).
• Printed articles or pages from the internet, printed on plain paper
• Children’s drawings on plain, undecorated paper
• Photocopies of documents when requested by the inmate
• Religious materials in some facilities, though many require these to come directly from a publisher or approved vendor
• Postcards and greeting cards (with restrictions — see the section below)

A general rule of thumb: if it is flat, on plain paper, and contains nothing that can conceal contraband, it will likely be accepted.

What You Cannot Include

Mailrooms screen every piece of incoming mail. Items on this list will cause your entire letter to be rejected, confiscated, or flagged — and repeated violations can get you banned from the inmate’s approved mail list.

• Stickers, labels, or adhesive tape on the letter or envelope (contraband can be hidden under adhesives)
• Glitter, confetti, or any loose material — this is treated as a security threat
• Polaroid photos (the layered construction can conceal drugs)
• Staples, paper clips, or metal fasteners
• Stamps or postage beyond what is needed (extra stamps have been used to smuggle substances)
• Food items, gum, candy, or anything edible
• Perfume, cologne, scented paper, or lipstick marks
• Crayon, marker, or paint (substances can be embedded in wax and pigments)
• Cash, checks, or money orders inside the letter — there is a separate process for sending money
• Envelopes with padding or lining
• Sexually explicit photos or content (most facilities prohibit this; some allow limited exceptions)
• Gang-related symbols, language, or references
• Information about other inmates, victims, or pending cases

When in doubt, keep it simple: a plain white envelope, plain white paper, written in blue or black ink.

Greeting Cards and Postcards

Many people want to send birthday cards, holiday cards, or thinking-of-you cards. Here is what you need to know:

• Postcards are accepted at nearly every facility and are often processed faster because they do not need to be opened and inspected.
• Greeting cards are allowed at many facilities, but they cannot contain glitter, metallic ink, thick embossing, pop-up elements, music chips, ribbons, or anything attached to the card.
• Some county jails have switched to postcard-only mail policies, meaning they will not accept letters in envelopes at all. Check your facility’s rules before sending.
• Cards must be store-bought or homemade on plain cardstock — no hand-decorated envelopes.

JPay and Electronic Messaging

JPay is the most widely used electronic messaging system in U.S. prisons and jails. It allows you to send emails, photos, and even short video messages to an inmate through a kiosk or tablet at the facility.

How JPay works:

1. Create a free account at JPay.com
2. Search for the inmate using their name and ID number
3. Purchase “stamps” — JPay’s digital currency (prices vary by state, typically $0.25 to $0.50 per message)
4. Write your message and attach photos if desired
5. The inmate receives the message on their JPay tablet or at a facility kiosk

Other facilities use different systems: GTL (Getting Through Lines), Securus Technologies, or Smart Communications. The facility’s website will tell you which system they use. Some state prison systems, like the Federal Bureau of Prisons, use their own system called CorrLinks for federal inmates.

Physical Mail vs. Electronic Messaging

	Physical Mail	Electronic Messaging
Delivery time	3–10 business days	24–48 hours (sometimes same day)
Cost	Cost of a stamp ($0.73 for first-class)	$0.25–$0.50 per message
Photos	Printed photos (limited quantity)	Digital photos (attached to messages)
Personal touch	High — handwritten letters are meaningful	Moderate — typed messages feel less personal
Privacy	Read and inspected by mailroom staff	Monitored and archived digitally
Keepsake value	Can be kept and re-read in the cell	Stored on tablet (may be lost during transfer)

Our recommendation: Use both. Send a handwritten letter for the personal connection and use electronic messaging for quick check-ins between letters. Inmates consistently say that receiving a physical letter is one of the most meaningful experiences during incarceration.

Can You Send Money in a Letter?

No. Do not put cash, checks, or money orders inside a letter to an inmate. The money will be confiscated, and your letter will likely be rejected.

If you want to put money on an inmate’s commissary account (so they can purchase snacks, hygiene products, stamps, and other items from the facility store), use one of these methods:

• Online deposit through the facility’s approved vendor (JPay, GTL, Access Corrections, or similar)
• Money order mailed separately to the facility’s finance office (not to the inmate directly) — the envelope should be addressed to the facility with the inmate’s name and ID on the money order
• Lobby kiosk at the facility during visiting hours
• Phone deposit by calling the facility’s commissary deposit line

Processing times vary. Online deposits are usually available within 24 to 72 hours. Mailed money orders can take one to two weeks.

Tips for Writing to Someone You Do Not Know Well

Whether you are writing to a pen pal, a friend of a friend, or someone in a prison ministry program, here are some guidelines:

• Introduce yourself briefly. Share your first name, where you live (city and state — not your full address beyond the return address), and why you are writing.
• Keep the first letter short. One to two pages is plenty. A long first letter can feel overwhelming.
• Ask open-ended questions. “What does a typical day look like for you?” is better than “Are you doing okay?” It gives them something to respond to.
• Share normal, everyday things. Talk about your day, the weather, a book you read, something funny that happened. People in jail and prison are starved for connection to the outside world.
• Be honest and respectful. Do not ask about their charges or case unless they bring it up first. Do not make promises you cannot keep.
• Do not share overly personal information in early letters. Protect your full address, workplace, and financial details until trust is established.
• Expect slow responses. Inmates may only have limited access to paper, stamps, and writing time. A two- to three-week response time is normal.

Frequently Asked Questions

How long does it take for a letter to reach an inmate?

Standard first-class mail typically takes 3 to 7 days to arrive at the facility. After that, the mailroom may take an additional 1 to 3 days to screen and distribute the mail. In total, expect 4 to 10 business days from the time you drop it in the mailbox. During holidays and lockdowns, it may take longer.

Can inmates write back?

Yes. Most inmates have access to paper and envelopes through the commissary, and facilities provide a certain number of free stamps per week or month for indigent inmates. Your letter will include your return address, which is how they will write back to you.

Will the facility read my letter?

Yes. All incoming and outgoing mail is subject to inspection. Mailroom staff open and visually inspect every piece of mail for contraband. In some facilities, letters are read in full; in others, they are scanned briefly. The only exception is legal mail (letters from an attorney), which is opened in front of the inmate but is not read by staff.

Can I send books or magazines?

Most facilities accept books and magazines, but they must be shipped directly from a publisher, bookstore, or approved vendor like Amazon or a prison book program. You generally cannot mail a used book from home. Softcover books are more widely accepted than hardcover. Check your specific facility’s policy, as some have banned physical books entirely in favor of digital tablets.

What happens if my letter is rejected?

If a letter violates the facility’s mail policy, it is typically returned to the sender with a notice explaining the reason for rejection. The inmate may also be notified. Common reasons for rejection include: no return address, prohibited items enclosed, inappropriate content, or incorrect inmate information. Repeated violations can result in being removed from the inmate’s approved correspondence list.

Can I send mail to an inmate in a different state?

Yes. There are no restrictions on sending mail across state lines. The same USPS first-class stamp that works for local mail will deliver your letter to any state or federal facility in the country. Just make sure you have the correct facility address and the inmate’s full legal name and ID number.