This CBHSQ Data Brief presents findings from the evaluation of the State Targeted Response to the Opioid Crisis Grants (Opioid STR) that describe how funding was used to support peer services for people with or recovering from opioid use disorder (OUD).  The evaluation revealed that most Opioid STR grantees used funds to implement, expand, or enhance peer services. The peer services most commonly provided were coaching, mentoring, and providing information and referrals to relevant services.The Opioid STR was the predecessor of the State Opioid Response (SOR) grant program and informed its development. At the start of SOR, grantees were expected to provide an array of services based on needs identified in their STR strategic plan. SOR addresses the opioid overdose crisis by providing resources to states and territories for increasing access to FDA-approved medications for the treatment of opioid use disorder (MOUD), and for supporting the continuum of prevention, harm reduction, treatment, and recovery support services.