San Mateo County Juvenile Hall
San Mateo County Juvenile Hall
County Juvenile HallMailing Address
22 Hall Scannell, San Mateo, CA 94402
Physical Address
22 Hall Scannell, San Mateo, CA 94402
Governing Agency
San Mateo County Probation Department
Inmate ID
Youth / Resident ID — Not required
Last Verified
September 29, 2026
Facility Mailing and Service Information
Verify the person's current custody/placement and identifier before mailing. Use the recipient's full legal name and follow the facility's current correspondence rules.
Source: Official sourceLast verified: September 29, 2026
Verify current photograph size, quantity and content restrictions before mailing.
Source: Official sourceLast verified: September 29, 2026
Verify current publication/package source and content rules before ordering.
Source: Official sourceLast verified: September 29, 2026
Do not send cash with ordinary correspondence. Use the current approved account-deposit method.
Source: Official sourceLast verified: September 29, 2026
Verify current visitor approval, identification, scheduling and facility rules before travel.
Source: Official sourceLast verified: September 29, 2026
How to Address Your Letter
Verify the person's current custody/placement and identifier before mailing. Use the recipient's full legal name and follow the facility's current correspondence rules.
About San Mateo County Juvenile Hall
San Mateo County Juvenile Hall is the county secure juvenile detention facility.