San Mateo County, California Jail & Detention Facility Guide
Confirm the current jail or detention location through the responsible San Mateo County agency before mailing, paying, visiting, calling, or traveling. This page combines county-specific geography, official-source routing, state corrections guidance, and transfer checks without inventing an unverified facility list.
Facility search: quick answer
Maguire Correctional Facility snapshot
| Operator | San Mateo County Sheriff's Office Corrections Division |
|---|---|
| Published address or location context | 300 Bradford Street, Redwood City, CA 94063 |
| Custody coverage | People shown in the San Mateo County Sheriff's current corrections custody system |
| Search method | Official Inmate Locator pathway for real-time custody lookup by name |
| Release/history limitation | The locator is not a full arrest-history or court-disposition database and does not cover California state or federal custody |
| Public phone | 650-599-3000 |
County profile for facility verification
The Census Bureau Vintage 2025 estimate for San Mateo County is 743,568 residents, compared with 762,639 in 2020. The estimated change was −19,071 people (2.5%). It ranks #15 among 58 county equivalents in California.
| Jurisdiction fact | Value | Facility-search relevance |
|---|---|---|
| Official Census name | San Mateo County | Confirms the county-equivalent connected to the facility search |
| GEOID | 06081 | Distinguishes same-named counties and cities |
| County-equivalent type | County | Explains the jurisdiction model |
| 2025 resident population | 743,568 | Provides jurisdiction scale; it is not jail population or capacity |
| Adjacent jurisdictions | 4 | Supports nearby checks during regional or cross-county housing |
How to confirm the current facility
- Open the parent San Mateo County inmate-search guide and identify the responsible sheriff, corrections department, detention center, regional jail, state agency, or other custodian.
- Use the verified custody method linked above.
- Confirm the exact facility name, booking or inmate number, current status, and jurisdiction.
- Open the official facility or agency page before sending mail, money, documents, or planning a visit.
- Reconfirm the location after court, medical transport, classification, contract placement, or transfer.
Why a jurisdiction can use more than one detention location
Local jail custody is normally handled by the responsible sheriff, county corrections department, detention center, regional jail, or another agency designated by the local government. State-prison and federal custody use separate systems. A jurisdiction may use an intake center, main jail, annex, work-release center, city jail, regional authority, juvenile facility, medical unit, courthouse holding area, or contracted beds. The public agency result or official information line is the best current source for where an adult is housed.
Facility details to verify
| Detail | Why it matters | Where to verify |
|---|---|---|
| Official facility name | Prevents confusion with an old, renamed, closed, or informal jail name | Responsible agency or current inmate result |
| Operating agency | Identifies the correct locator, phone, mail, money, and visitation rules | Sheriff, corrections, regional authority, state, or contracted public portal |
| Street and mailing address | Physical location and inmate-mail address can differ | Current official facility page |
| Public information phone | Confirms urgent transfer or release questions when published | Official contact page |
| Custody population served | A building may handle intake, pretrial, sentenced, work-release, medical, or another group | Agency facility description |
| Search relationship | Shows whether the county search covers the facility or another system must be used | Locator coverage statement |
Mail, money, visitation, and phone services
Do not use a facility address or vendor from an old third-party page. Open the current official sheriff, corrections, jail, regional authority, or facility page and confirm the recipient format, inmate number, permitted items, vendor, visitation approval process, schedule, identification requirements, and communication rules. Transfers can invalidate previously correct instructions.
When the facility shown online changes
A location can change after court, classification, sentence, disciplinary action, medical care, protective placement, overcrowding, regional placement, contract housing, state transfer, federal hold, or release processing. A changed location does not by itself explain the person’s legal status.
State and federal alternatives
If the person has entered state custody, use the California state inmate-search guide. The state agency is California Department of Corrections and Rehabilitation and the published state tool is CIRIS. If federal custody is confirmed, use the federal BOP guide.
Nearby county searches
Alameda County inmate search
California · GEOID 06001
San Francisco County inmate search
California · GEOID 06075
Santa Clara County inmate search
California · GEOID 06085
Santa Cruz County inmate search
California · GEOID 06087
How this guide avoids stale facility data
The parent county has a verified official custody pathway, but current facility details still must be reconfirmed before action.