King County Youth Service Center / Juvenile Detention
King County Youth Service Center / Juvenile Detention
County Juvenile Detention CenterMailing Address
[Resident / Inmate Full Name] — [ID if known]
King County Youth Service Center / Juvenile Detention
1211 E. Alder Avenue, Seattle, WA 98122
King County Youth Service Center / Juvenile Detention
1211 E. Alder Avenue, Seattle, WA 98122
Physical Address
1211 E. Alder Avenue, Seattle, WA 98122
Governing Agency
King County Department of Adult and Juvenile Detention
Inmate ID
Youth / Resident ID — Not required
Last Verified
September 29, 2026
Facility Mailing and Service Information
Confirm the youth's current placement at King County juvenile detention before mailing and use the youth's full legal name and resident/client ID if known.
Last verified: September 29, 2026
Verify current photo size, quantity and content restrictions before sending photographs.
Last verified: September 29, 2026
Verify current publication and package rules before sending books or packages.
Last verified: September 29, 2026
Do not send cash with ordinary correspondence. Use the facility's approved deposit method.
Last verified: September 29, 2026
Verify current visitor approval, identification and scheduling requirements before travel.
Last verified: September 29, 2026
How to Address Your Letter
Confirm the youth's current placement at King County juvenile detention before mailing and use the youth's full legal name and resident/client ID if known.
About King County Youth Service Center / Juvenile Detention
King County Youth Service Center at 1211 E. Alder Avenue includes juvenile court and juvenile detention services.