- Cellblock Mail
 - Personal ads of men and women pen pals in prison. - Convictmailbag.com
- Provides names and addresses of lonely prisoners needing mail. Includes a section to buy an ad for a prisoner you know and a place to buy discount stamps.
- Cyberspace Inmates
- Correspond with inmates via email. Also contains an art gallery, memorials, and subscription information about "Climbing the Walls", an inmate magazine.
- DOC's Prison Pen Pals
- Pen pals service for male and female inmates. Includes photographs and addresses.
- Friends Beyond the Wall
- Prisoner network that includes pen pals, classifieds, greetings, recipes, and more.
- Friends on Both Sides
- Specialising in developing relationships between prison inmates and caring individuals seeking companionship.
 Human Writes
- Nonprofit organisation which offers friendship and support to people on death row through letter-writing.- INMATE Classified
- Contains personal classifieds posted by inmates and those on the outside seeking to share their experiences and meet new people.
- InmateLetters.com
- Inmate Letters provides introductions and personal information about men and women in prison who are ready to correspond through mail.
- Lost Vault, The
- Resource and directory contact for prison pen pals, prisoner rights, and prisoner activism. Includes forums, chat, and pen pal writing tips.
- Meet-An-Inmate.com
- Includes profiles and photos of incarcerated men and women seeking correspondence and companionship.
- Paper Dolls
- Female inmates looking for snail mail penpals. Check out photo profiles and search by state or age range.
- Penpals-N-Prison.com
- Lists personal profiles of male and female prison inmates across the U.S. Organised by state.
- Prison Pen Pals
- National listing of prison inmate profiles complete with contact information.
- PrisonerLife.com
- Provides prisoners with opportunities to communicate with Internet users and expand their networks of support.
- PrisonVoice.com
- Prison pen pal site dedicated to helping lonely men and women prisoners make new positive relationships through letter writing.
- SG's Prison Pen Pals
- Photos and biographical profiles of adult prison inmates seeking correspondence, friendship, and love.
- Transcend the Walls
- Features profiles of inmates looking for pen pals.
- Very Special Women
- Introduction service for women confined in correctional institutions.
- Voices from Inside
- U.S. death row inmates searching for pen pals. Organised by state.
- Women Behind Bars
- Female inmates searching for correspondence, companionship, and love.
- Womeninprison.com
- Features female inmates currently incarcerated in American prisons looking for pen pals, friendship, and more.
- WriteAPrisoner.com
- Offers photos and biographical profiles of inmates seeking pen pals from around the U.S.
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