Carroll is the county seat of Carroll County. People having difficulties overcoming opioid addiction in Carroll or nearby cities may consider medically treating it at any methadone clinic in Carroll. As of 2018, the city had a population estimated at 9,812. It has a total area of 14.84 km². Although Carrol is not a big city, the possibility of it being home to a number of people dealing with opioid use disorder should not be ruled out. All methadone clinics in Iowa are required to register with the Drug Enforcement Administration. Methadone is safe and essential but it is regulated because it is at the risk of being diverted to the illicit market and misuse could be risky. Ideally, methadone is not to be found in any other place than methadone clinics that are accredited by the Substance Abuse and Mental Health Services Administration. Patients who want to undergo methadone maintenance are required to indicate voluntary interest after the health provider provides them with information on all the possible side effects and risk factors. For the first few days of the dispensing of methadone to a program enrollee, patients are placed under close observation. The doses are adjusted with time. Usually, they are reduced, but in some cases, the health practitioner may see a reason to increase them.