How to write to someone at Mule Creek State Prison
Mail personal letters to the address below, filling in the person's name and ID number where marked.
Checked against the department's own pages . How we check, and corrections
MAIL TO
Dashed lines are for you to fill in, in the department's own words.
Envelope order: full name, CDC number, institution name, P.O. Box housing (preferable), city, CA ZIP. The department doesn't say this address is for personal mail; check with the facility before you write.
- City
- Ione
- Phone
- (209) 274-4911
- Where letters go
- To the prison
- What happens to them
- Opened and inspected; the letter itself is delivered
- What they get
- Your original letter
“Incoming letters are opened and inspected for contraband and then forwarded to the incarcerated person.” Department source
Street address (not for letters unless the department says so): 4001 Highway 104, Ione, CA 95640
“Individuals are free to contact any state prison incarcerated person by mail. Incoming letters are opened and inspected for contraband and then forwarded to the incarcerated person.”
No one at Mule Creek State Prison is listed yet. Know someone there who wants mail? List them for $50.
Securus eMessaging
You start it from outside.
- Create a Securus Online account at securustech.net or in the Securus mobile app.
- Find the person you want to write to and add them as a contact.
- Buy a book of stamps. The price per stamp is shown once you pick the person, because it varies by facility.
- Write and send your message. Attach a return stamp if you want them to be able to reply.
- The person inside cannot message you until you have added them and sent the first message.
California: CDCR is moving from ViaPath to Securus tablets. Fire camps and 16 institutions had switched by the August 21, 2026 schedule; about 15 institutions were still pending with dates TBD. Use Securus once your loved one's institution has transitioned.
ViaPath ConnectNetwork Messaging
You start it from outside.
- Create a free account at connectnetwork.com and add the facility to your account.
- Open Messaging and search for the person by name or ID (booking) number, then add them as a contact.
- Buy message credits with a credit or debit card. The rate for that facility shows when you click Buy Credits.
- Write and send your message. Where the facility allows it, attach credits so the person can reply.
California: CDCR is replacing ViaPath with Securus institution by institution (see Securus entry). ViaPath messages and photos do not carry over to the new tablets.
ViaPath ConnectNetwork Messaging's own page · All messaging apps
Questions
What is the mailing address for Mule Creek State Prison?
Incarcerated person’s full name, CDC#, Mule Creek State Prison, P.O. Box 409099, Ione, CA 95640.
Is mail scanned at Mule Creek State Prison?
No. Personal letters are opened and inspected, and the letter itself is delivered at the prison. The person receives your original letter.
Can I message someone at Mule Creek State Prison electronically?
California uses Securus eMessaging and ViaPath ConnectNetwork Messaging. On Securus eMessaging, you make an account, add the person by name and ID number, and pay per message. On ViaPath ConnectNetwork Messaging, you make an account, add the person by name and ID number, and pay per message.
Can someone at Mule Creek State Prison be listed on a pen pal site?
We found no rule in California's published policies against it, and normal mail rules still apply. Rules change; the department's page is the final word.
Something wrong or out of date? Tell us and we fix it from the department's page. How we check.
Sources: Mule Creek State Prison page, California mail rules, read 2026-10-07. Rules change; the department's page is the final word. Find someone: official inmate locator.
How to write your first letter · All California prisons and rules