Marin County, California Jail & Detention Facility Guide
Confirm the current jail or detention location through the responsible Marin 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
Marin County Jail snapshot
| Operator | Marin County Sheriff's Office Detention Bureau |
|---|---|
| Published address or location context | 13 Peter Behr Drive, San Rafael, CA 94903 |
| Custody coverage | People booked into Marin County Jail during the last 48 hours who remain in custody and the complete current inmate list available when the search is run |
| Search method | Official Marin County Public Booking Log, which includes recent bookings still in custody and a current inmate list, plus direct jail confirmation |
| Release/history limitation | The list reflects the moment searched, exact bail must be confirmed with the jail, and older or released records are not a complete history or final disposition |
| Public phone | 415-473-6655 |
County profile for facility verification
The Census Bureau Vintage 2025 estimate for Marin County is 253,694 residents, compared with 261,337 in 2020. The estimated change was −7,643 people (2.9%). It ranks #26 among 58 county equivalents in California.
| Jurisdiction fact | Value | Facility-search relevance |
|---|---|---|
| Official Census name | Marin County | Confirms the county-equivalent connected to the facility search |
| GEOID | 06041 | Distinguishes same-named counties and cities |
| County-equivalent type | County | Explains the jurisdiction model |
| 2025 resident population | 253,694 | 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 Marin 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
Contra Costa County inmate search
California · GEOID 06013
San Francisco County inmate search
California · GEOID 06075
Solano County inmate search
California · GEOID 06095
Sonoma County inmate search
California · GEOID 06097
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.