Tri-County Youth Development Center is a 24-hour secure juvenile detention facility on the Tri-County Youth Rehabilitation Campus in Marysville. It serves youth under juvenile-court jurisdiction or pending criminal charges in adult court.

The center is at 938 14th Street, Marysville, CA 95901. Youth correspondence uses the same address. The shared phone line is (530) 741-6371; use extension 2 for Youth Development Center visit scheduling.