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How to send a letter to an inmate at Kane County Adult Justice Center

To write to someone held at Kane County Adult Justice Center, address the envelope to the inmate's full name and detainee ID number, Kane County Adult Justice Center, 37W755 Illinois Route 38, Suite B, St. Charles, IL 60175. Kane County Adult Justice Center is the jail for Kane County, Illinois, run by the Kane 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 — Kane County Adult Justice Center

[Inmate's full name]  [detainee ID number]
Kane County Adult Justice Center
37W755 Illinois Route 38, Suite B
St. Charles, IL  60175

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

Verified September 2026kanesheriff.com

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Your name
Your return address

Kane County Adult Justice Center37W755 Illinois Route 38, Suite BSt. Charles, IL 60175

Your letter, printed and mailed for you.

Key facts

  • Send mail to Kane County Adult Justice Center, 37W755 Illinois Route 38, Suite B, St. Charles, IL 60175 — the jail's own mailroom.
  • Write the inmate's full name and detainee ID 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.
  • Unlimited letters are allowed through the US Postal Service.
  • No glitter, lipstick, electronic music devices, glue, or tape.
  • Unused stamps are not accepted in the envelope.
  • 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 Kane County Sheriff's Office's online inmate roster to confirm they're still at Kane County Adult Justice Center — and get their detainee ID number — before you mail anything.

  2. 2

    Address it correctly

    First line: the inmate's full name and detainee ID number. Then Kane County Adult Justice Center, 37W755 Illinois Route 38, Suite B, St. Charles, IL 60175. 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. Unlimited letters are allowed through the US Postal Service. 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 Kane County Adult Justice Center?

Put the inmate's full name and detainee ID number on the first line, then Kane County Adult Justice Center, 37W755 Illinois Route 38, Suite B, St. Charles, IL 60175. Include your full return address in the top-left corner of the envelope.

Is mail to Kane County Adult Justice Center 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 Kane County Sheriff's Office's inmate roster to confirm they're still at Kane County Adult Justice Center before you send.

What can I send to Kane County Adult Justice Center?

Unlimited letters are allowed through the US Postal Service. No glitter, lipstick, electronic music devices, glue, or tape. Unused stamps are not accepted in the envelope. 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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