Mental health certified peer specialists (CPS) have personal experience of mental health conditions and are employed to support the self-directed recovery of others living with these conditions. Peer specialist certification began in 2001 and federal Medicaid reimbursement for peer support services was authorized in 2007, leading to a significant increase in the numbers of certified peer specialists throughout the U.S. The survey we undertook in 2016 found that .almost all states now have peer specialist training and certification programs. A total of 25,317 peer specialists had been certified. Arizona, Washington, Pennsylvania and South Carolina had the highest proportions of peer specialists per 100,000 population. A table in the article shows the number of CPS per 100,000 population for all states, the District of Columbia (DC) and the U.S. Department of Veterans Affairs (VA). The article provides additional information about agencies responsible for certification, as well as available CPS specialty areas, such as co-occurring disorders, families, forensic, and youth.