County Jail #3 Overview
San Francisco County Jail #3 is operated by the San Francisco Sheriff's Office. It sits in San Bruno, which places the building inside San Mateo County geography, but its custody role belongs to the City and County of San Francisco. That makes the facility a common geography trap for inmate lookup. A San Mateo arrest normally routes through Maguire and the San Mateo County inmate locator. County Jail #3 houses San Francisco male jail population.
The San Francisco Sheriff's jail services page says the San Bruno facility opened in 2005, was formerly known as County Jail #5, is San Francisco's largest facility, and remains under San Francisco jurisdiction. SF.gov's jail population page documents County Jail #3 in San Bruno as part of San Francisco's jail system. Those San Francisco sources control lookup, visiting, population, and jail-service questions.
The San Francisco Sheriff's jails page provides facility context for County Jail #3.
The screenshot reinforces the most important point for records work: the facility is listed by San Francisco, not by San Mateo County Corrections.
County Jail #3 Capacity
SF.gov's jail population page states that County Jail #3 in San Bruno houses incarcerated males and had a rated capacity of 768 beds as of July 2024. That figure is specific to this San Francisco-operated facility. It should not be merged with San Mateo County's Maguire or Maple Street capacity figures because the operator, population, and reporting system are different.
The SF.gov jail population page is the capacity source captured for this build.
Use the SF.gov data page for San Francisco population context, and use San Mateo sources only for San Mateo-operated facilities.
County Jail #3 Lookup
County Jail #3 lookup must follow the San Francisco Sheriff's process for finding a person in jail. Do not use the San Mateo County inmate locator for this facility unless the question is about a different person or a separate San Mateo County booking. The San Mateo locator covers Maguire, Maple Street, and related San Mateo sheriff custody, not San Francisco's San Bruno jail.
- Start with the San Francisco Sheriff's jail-services channels, not the San Mateo locator.
- Confirm the person is in San Francisco custody and that the facility is County Jail #3 in San Bruno.
- Use San Francisco jail visiting, mail, release, and property instructions for next steps.
- If the arrest or case is in San Mateo County instead, switch back to the San Mateo sheriff locator and court records.
This distinction is practical. A San Francisco custody result may involve San Francisco court dates, San Francisco Sheriff's rules, and San Francisco release processing. A San Mateo arrest usually involves Maguire booking, San Mateo Superior Court, and the San Mateo County District Attorney process.
County Jail #3 Contact
Use the San Bruno facility contact for County Jail #3. Because the facility is operated by San Francisco, San Mateo County Sheriff's Office staff are not the right source for San Francisco custody, visiting, or mail questions. Confirm current hours, service windows, and visiting access with San Francisco jail services before traveling.
San Francisco County Jail #3
1 Moreland Drive
San Bruno, CA 94066
(650) 266-7500
Operated by the San Francisco Sheriff's Office.
County Jail #3 Visiting
Visitation for County Jail #3 is not governed by San Mateo County Maguire or Maple Street PDFs. Use San Francisco Sheriff's Office jail visiting instructions for appointment rules, identification, dress, property limits, professional visits, and any video or remote options. The research did not capture an official day-and-hour table for County Jail #3, so the table below avoids invented schedule slots.
| Visit item | Correct source | Conservative use |
|---|---|---|
| Personal visits | San Francisco Sheriff's jail services | Check current SFSO instructions before travel. |
| Facility confirmation | San Francisco custody lookup or jail staff | Confirm the person is at County Jail #3. |
| San Mateo schedules | Not applicable | Do not use Maguire or Maple Street visiting PDFs for this facility. |
Visitors should expect jail security screening and should bring only what San Francisco jail rules allow. Note: A San Bruno address does not make this a San Mateo County visiting process.
County Jail #3 Mail
Mail, phone, money, and commissary instructions for County Jail #3 must come from San Francisco jail services. San Mateo County's Smart Communications address, Keefe commissary page, Maguire publication address, and Maple Street publication address are not the correct sources for San Francisco County Jail #3. Sending mail under San Mateo rules can misroute or reject the item.
| Service | Correct routing |
|---|---|
| Personal mail | Use San Francisco Sheriff's current jail mail instructions. |
| Money or commissary | Use San Francisco-approved deposit and commissary channels. |
| Phone or video | Use San Francisco jail-services instructions and vendor information. |
When a family member is unsure whether the person is in San Francisco or San Mateo custody, confirm the arresting agency, court county, and facility location before sending mail or money.
County Jail #3 Intake
County Jail #3 should not be described as San Mateo's intake jail. San Mateo County bookings were stated to happen at Maguire. County Jail #3 serves San Francisco custody and is tied to San Francisco jail operations. People housed there may have San Francisco cases, San Francisco holds, or other custody paths managed through the San Francisco Sheriff's Office.
Federal, state, and immigration custody are separate systems again. CDCR CIRIS covers California state prison after sentencing and transfer. The BOP locator covers sentenced federal prisoners and some federal custody. ICE ODLS covers immigration detention. None of those systems should be used as a substitute for San Francisco Sheriff's custody lookup when the person is believed to be at County Jail #3.
County Jail #3 Records
Records from County Jail #3 are San Francisco records. San Mateo public-record request channels are not the normal route for San Francisco jail custody documents. A request about San Francisco booking, custody, visiting, release, mail, or facility policy should start with San Francisco agencies and San Francisco records procedures.
County Jail #3 is included here only because it is physically located in San Bruno within San Mateo County. For people held by the San Mateo County Sheriff's Office, use the San Mateo custody system and the county facility pages for Maguire, Maple Street, the Transitional Facilities, or Alternative Sentencing. For people held by San Francisco, use San Francisco Sheriff's Office sources from the start.
Note: Confirm the operator before acting because San Francisco County Jail #3 is in San Bruno but serves San Francisco custody.