Opioid overdose deaths in the United States have risen dramatically in the past decade. In response to this public health crisis, Vermont created an innovative system called the "hub-and-spoke" (H & S) system, initiated in January 2013. The H & S system has 7 regional "hubs" that offer methadone and buprenorphine, as well as intensive support, and 77 local "spokes" (primary care settings) that offer buprenorphine (and naltrexone to a much lesser extent). Questionnaires were administered to 80 participants in the H & S system (stratified by geographic region, treatment site, and gender) and 20 participants with opioid use disorder not currently in treatment. Data included demographics, drug and alcohol use; opioid use; injection use; education/employment; criminal justice involvement; family and relationship functioning; health and healthcare utilization; multiple areas of mental health functioning; opioid overdose; satisfaction with life areas; stigma; and perceived treatment effectiveness. In-treatment group participants reported use and functioning for the 90 days prior to the date of the interview (T₂) and, retrospectively, a comparable 90-day period prior to treatment entry (T₁). Out-of-treatment group participants were queried about functioning at the time of the interview (T₂) and 12 months earlier (T₁). Individuals not in treatment showed no meaningful changes in any domain from T₁ to T₂. Conversely, participants currently in treatment in the H & S system showed large reductions in substance use, overdoses, emergency department visits, police contacts, and family conflict, and improvements in mood and satisfaction with all areas of life, except work/school participation. Additionally, 85% of in-treatment participants reported 90-day abstinence from opioid use compared to 0% of out-of-treatment participants at T₂. These findings illustrate that medication for opioid use disorders, as delivered in the H & S system in Vermont, is highly effective for reducing opioid use and overdose and improving functioning in many life domains.