How to mail a letter to an inmate at Sierra Conservation Center

To write to someone held at Sierra Conservation Center, address your envelope to the inmate's full committed name and CDCR number, Sierra Conservation Center, 5150 O'Byrnes Ferry Road, Jamestown, CA 95327. Sierra Conservation Center is a conservation center in Jamestown, California, operated by the California Department of Corrections and Rehabilitation.

Inmate mail — Sierra Conservation Center

[Inmate's full committed name]  [CDCR number]
Sierra Conservation Center
5150 O'Byrnes Ferry Road
Jamestown, CA  95327

Put the inmate's full committed name and CDCR 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 CDCR number is returned.

Verified August 2026cdcr.ca.gov cdcr.ca.gov

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Sierra Conservation Center5150 O'Byrnes Ferry RoadJamestown, CA 95327

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Key facts

Send mail to Sierra Conservation Center, 5150 O'Byrnes Ferry Road, Jamestown, CA 95327 — the institution's inmate-mail address, not its street address.
Sierra Conservation Center is located at 5100 O'Byrnes Ferry Road, Jamestown, CA, but inmate mail must go to the mailing address above — a letter sent to the street address can be returned.
California delivers inmate mail to each prison directly — but to the institution’s inmate-mail P.O. box, not its street address. Address it to the person’s full committed name, CDCR number, and housing/bed.
Several CDCR prisons use a different P.O. box for each housing facility (yard). Confirm the person’s current housing and use the matching box, or the letter is delayed.
Include your full name and return address. Mail without the correct CDCR number, or without a return address, can be rejected or returned.
Incoming personal mail is opened and inspected for contraband before it is delivered. Keep to plain letter-size paper; send copies of anything you are not willing to lose.
People are transferred between prisons without notice — check CDCR’s inmate locator for the current institution and housing before you mail anything.
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
Confirm the person is still at Sierra Conservation Center
Inmates are transferred between facilities without notice. Confirm they are still at Sierra Conservation Center — and double-check the CDCR number — before you mail anything, using the California Department of Corrections and Rehabilitation (CDCR)'s official inmate locator.
2
Address it exactly
First line: the inmate's full committed name and CDCR number. Then Sierra Conservation Center, 5150 O'Byrnes Ferry Road, Jamestown, CA 95327. Add your full return address.
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
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 Sierra Conservation Center?

Put the inmate's full committed name and CDCR number on the first line, then Sierra Conservation Center, 5150 O'Byrnes Ferry Road, Jamestown, CA 95327. Include your full first and last name and return address on the envelope.

Is mail to Sierra Conservation Center opened, read, or scanned?

Expect it to be. Incoming personal mail is opened and inspected for contraband and can be read under the California Department of Corrections and Rehabilitation (CDCR)'s rules.

What can I send to Sierra Conservation Center — photos, cards, or books?

Standard photo prints are generally allowed, usually limited in number and no larger than 8" x 10". No polaroids, and nothing nude, sexually explicit, or gang-related. Books, magazines, and newspapers must come directly from an approved publisher or vendor — they cannot be sent as personal mail.

What can't I mail to Sierra Conservation Center?

Do not send: Cash, checks, money orders, or postage stamps; Any item other than paper (no polaroids, laminated cards, or enclosures); Nude, sexually explicit, or gang-related photos or content; Stickers, glitter, glue, tape, perfume, lipstick, or crayon/marker; Paper treated with any substance, or anything with drug residue. 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 Sierra Conservation Center before mailing, since the California Department of Corrections and Rehabilitation (CDCR) 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 California inmate mail rules — what you can and can’t send, photos & more →