Found that having a peer specialist on staff was associated with increases in outpatient service use in both counties, and with reduced disparities in service use among Black and Latinx youth in Los Angeles County. The availability of a peer specialist with racial/ethnic concordance was also associated with greater outpatient service use among Latinx youth in both counties. These results suggest that peer support services are a promising approach to reducing the documented low rate of continued engagement in mental health services among youth