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How to send a letter to an inmate at Bonneville County Jail

To write to someone held at Bonneville County Jail, address the envelope to the inmate's full name and booking number, Bonneville County Jail, 605 N Capitol Ave, Idaho Falls, ID 83402. Bonneville County Jail is the jail for Bonneville County, Idaho, run by the Bonneville County Sheriff's Office. Mail is opened and inspected — include your full return address, and double-check the person is still in custody, since people are released or moved from a county jail quickly.

Inmate mail — Bonneville County Jail

[Inmate's full name]  [booking number]
Bonneville County Jail
605 N Capitol Ave
Idaho Falls, ID  83402

Put the inmate's full name and booking number on the first line, and your full return address in the corner — mail without either is usually rejected.

Verified September 2026bonnevillesheriff.com

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Your name
Your return address

Bonneville County Jail605 N Capitol AveIdaho Falls, ID 83402

Your letter, printed and mailed for you.

Key facts

  • Send mail to Bonneville County Jail, 605 N Capitol Ave, Idaho Falls, ID 83402 — the jail's own mailroom.
  • Write the inmate's full name and booking number on the envelope, plus your full return address, or the letter is returned.
  • All incoming mail is opened and inspected for contraband before it reaches the inmate.
  • Do not enclose cash, checks, gift cards, or anything other than paper — prohibited items get the whole letter rejected.
  • Include a full name and correct return address on the envelope, or mail will not be delivered.
  • No cash, stamps, stickers, glitter, glue, tape, staples, paperclips, or polaroid photos.
  • Legal mail is opened in the inmate's presence to protect attorney-client confidentiality.
  • County jails move fast — people are released, bailed out, or transferred within days. Confirm the person is still in custody before mailing anything time-sensitive.
  • PostPal prints and mails your letter for you the next business day for $5 — with your return address printed so they can write back, and no printer, envelope, or stamp needed.

How to send your letter

  1. 1

    Confirm the person is still at the jail

    County-jail populations turn over quickly. Check the Bonneville County Sheriff's Office's online inmate roster to confirm they're still at Bonneville County Jail — and get their booking number — before you mail anything.

  2. 2

    Address it correctly

    First line: the inmate's full name and booking number. Then Bonneville County Jail, 605 N Capitol Ave, Idaho Falls, ID 83402. Add your full return address in the top-left corner.

  3. 3

    Keep the contents allowed

    A plain letter on white paper is always safest. Include a full name and correct return address on the envelope, or mail will not be delivered. No cash, gift cards, or any object other than paper.

  4. 4

    Send it without a printer

    Write or upload your letter in 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 Bonneville County Jail?

Put the inmate's full name and booking number on the first line, then Bonneville County Jail, 605 N Capitol Ave, Idaho Falls, ID 83402. Include your full return address in the top-left corner of the envelope.

Is mail to Bonneville County Jail opened or read?

Yes. All incoming mail is opened and inspected for contraband before delivery, and non-legal mail can be read.

What if they've been released or moved?

It happens fast at a county jail — people bond out or transfer within days, and the letter won't be forwarded. Check the Bonneville County Sheriff's Office's inmate roster to confirm they're still at Bonneville County Jail before you send.

What can I send to Bonneville County Jail?

Include a full name and correct return address on the envelope, or mail will not be delivered. No cash, stamps, stickers, glitter, glue, tape, staples, paperclips, or polaroid photos. Legal mail is opened in the inmate's presence to protect attorney-client confidentiality. When in doubt, a plain letter on white paper is always accepted.

Can the inmate write back to me?

Yes, if you include a complete return address. PostPal prints your return address on the letter for you.

Sources

Addresses verified September 2026 against official sources. Always confirm on the official site before time-sensitive filings.

See the full US county & city jails rules — what you can and can’t send, photos & more →

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