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

To write to someone held at McHenry County Jail, address the envelope to the inmate's full name and jail ID number, McHenry County Jail, 2200 N Seminary Ave, Woodstock, IL 60098. McHenry County Jail is the jail for McHenry County, Illinois, run by the McHenry 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 — McHenry County Jail

[Inmate's full name]  [jail ID number]
McHenry County Jail
2200 N Seminary Ave
Woodstock, IL  60098

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

Verified September 2026mchenrysheriff.org

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Your name
Your return address

McHenry County Jail2200 N Seminary AveWoodstock, IL 60098

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Key facts

  • Send mail to McHenry County Jail, 2200 N Seminary Ave, Woodstock, IL 60098 — the jail's own mailroom.
  • Write the inmate's full name and jail 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.
  • Mail must be sent through USPS — it cannot be dropped off in person.
  • Mail is delivered within 24 hours of receipt, excluding weekends and holidays.
  • Include the inmate's full name, jail ID number, and your return address.
  • 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 McHenry County Sheriff's Office's online inmate roster to confirm they're still at McHenry County Jail — and get their jail ID number — before you mail anything.

  2. 2

    Address it correctly

    First line: the inmate's full name and jail ID number. Then McHenry County Jail, 2200 N Seminary Ave, Woodstock, IL 60098. 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. Mail must be sent through USPS — it cannot be dropped off in person. 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 McHenry County Jail?

Put the inmate's full name and jail ID number on the first line, then McHenry County Jail, 2200 N Seminary Ave, Woodstock, IL 60098. Include your full return address in the top-left corner of the envelope.

Is mail to McHenry 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 McHenry County Sheriff's Office's inmate roster to confirm they're still at McHenry County Jail before you send.

What can I send to McHenry County Jail?

Mail must be sent through USPS — it cannot be dropped off in person. Mail is delivered within 24 hours of receipt, excluding weekends and holidays. Include the inmate's full name, jail ID number, and your return address. 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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