How to mail a letter to an inmate at California State Prison, Los Angeles County

To write to someone held at California State Prison, Los Angeles County, address your envelope to the inmate's full committed name and CDCR number, California State Prison, Los Angeles County, P.O. Box 4430, Lancaster, CA 93539. California State Prison, Los Angeles County is a state prison in Lancaster, California, operated by the California Department of Corrections and Rehabilitation.

Inmate mail — California State Prison, Los Angeles County

[Inmate's full committed name]  [CDCR number]
California State Prison, Los Angeles County
P.O. Box 4430
Lancaster, CA  93539

Which P.O. box you use depends on the person's housing facility (yard) at California State Prison, Los Angeles County — pick the box listed for their yard below, and confirm their current housing on the California Department of Corrections and Rehabilitation (CDCR)'s inmate locator. Put the inmate's full committed name and CDCR number on the first line.

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

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California State Prison, Los Angeles CountyP.O. Box 4430Lancaster, CA 93539

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Key facts

California State Prison, Los Angeles County uses a different P.O. box for each housing facility (yard), all in Lancaster, CA 93539: A & ASU → P.O. Box 4430; B → P.O. Box 4490; C → P.O. Box 4610; D → P.O. Box 4670; Minimum Support Facility → P.O. Box 4730. Use the box matching the person's current housing.
California State Prison, Los Angeles County is located at 44750 60th Street West, Lancaster, 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 California State Prison, Los Angeles County
Inmates are transferred between facilities without notice. Confirm they are still at California State Prison, Los Angeles County — 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 California State Prison, Los Angeles County, the P.O. box for their housing yard (see the list above), Lancaster, CA 93539. 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 California State Prison, Los Angeles County?

Put the inmate's full committed name and CDCR number on the first line, then California State Prison, Los Angeles County, P.O. Box 4430, Lancaster, CA 93539. Include your full first and last name and return address on the envelope.

Is mail to California State Prison, Los Angeles County 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 California State Prison, Los Angeles County — 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 California State Prison, Los Angeles County?

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 California State Prison, Los Angeles County 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 →