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How to mail a letter to an inmate at South Idaho Correctional Institution

To write to someone held at South Idaho Correctional Institution, address your envelope to the inmate's full committed name and IDOC number, South Idaho Correctional Institution, 13900 South Pleasant Valley Road, Kuna, ID 83634. South Idaho Correctional Institution is a state prison in Kuna, Idaho, operated by the Idaho Department of Correction.

Inmate mail — South Idaho Correctional Institution

[Inmate's full committed name]  [IDOC number]
South Idaho Correctional Institution
13900 South Pleasant Valley Road
Kuna, ID  83634

Put the inmate's full committed name and IDOC number on the first line, and mail to the institution's inmate-mail address here — not its street address. Mail without a usable name and IDOC number is returned.

Verified August 2026idoc.idaho.govidoc.idaho.gov

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Your name
Your return address

South Idaho Correctional Institution13900 South Pleasant Valley RoadKuna, ID 83634

Your letter, printed and mailed for you.

Key facts

  • Send mail to South Idaho Correctional Institution, 13900 South Pleasant Valley Road, Kuna, ID 83634 — the institution's inmate-mail address, not its street address.
  • Idaho sends mail to each facility directly. Address it to the resident’s committed name (no nicknames), IDOC number, institution, and housing/unit, then the facility’s own mailing address.
  • Use a plain white legal- or letter-size envelope with your full name and return address. Mail that doesn’t meet the format can be returned to sender.
  • Personal letters are opened and searched for contraband in front of the resident but not read; acceptable mail is delivered within about 24 hours on business days.
  • Confirm the person’s current facility and unit on IDOC’s resident search before mailing — people are transferred between facilities without notice.
  • 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. 1

    Confirm the person is still at South Idaho Correctional Institution

    Inmates are transferred between facilities without notice. Confirm they are still at South Idaho Correctional Institution — and double-check the IDOC number — before you mail anything, using the Idaho Department of Correction (IDOC)'s official inmate locator.

  2. 2

    Address it exactly

    First line: the inmate's full committed name and IDOC number. Then South Idaho Correctional Institution, 13900 South Pleasant Valley Road, Kuna, ID 83634. Add your full return address.

  3. 3

    Keep the contents allowed

    Plain letter-size paper is safest. 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. 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 South Idaho Correctional Institution?

Put the inmate's full committed name and IDOC number on the first line, then South Idaho Correctional Institution, 13900 South Pleasant Valley Road, Kuna, ID 83634. Include your full first and last name and return address on the envelope.

Is mail to South Idaho Correctional Institution opened, read, or scanned?

Expect it to be. Incoming personal mail is opened and inspected for contraband and can be read under the Idaho Department of Correction (IDOC)'s rules.

What can I send to South Idaho Correctional Institution — photos, cards, or books?

Photos are generally allowed; no polaroids or laminated photos, and nothing nude or sexually explicit. Books and magazines must come directly from a publisher or approved vendor, not in personal mail.

What can't I mail to South Idaho Correctional Institution?

Do not send: Cash, checks, money orders, or postage stamps; Any item other than paper (no polaroids, laminated items, or enclosures); Nude, sexually explicit, or contraband-promoting content; Stickers, glitter, glue, tape, perfume, lipstick, or crayon/marker; Colored envelopes (white envelopes only) or publications not from an approved publisher/vendor. 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 South Idaho Correctional Institution before mailing, since the Idaho Department of Correction (IDOC) 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 Idaho inmate mail rules — what you can and can’t send, photos & more →

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