Vincennes, the county seat of Knox County, is one of the cities that has been consistently recording a decrease in population in the last few years. However, because of how opioid use disorder has become a problem in almost every part of the nation and the world at large, there is a probability that Vincennes is home to a number of people suffering from it. Such people should consider visiting any Vincennes methadone clinic for methadone maintenance. As of 2018, the city had a population estimated at 17,171. It has a total area of 19.37 km² of which 0.91% is water. Methadone clinics are specialists in the dispensing of methadone for the treatment of opioid use disorder but some methadone clinics in Indiana may offer additional services. methadone is approved by the Food and Drug Administration and the methadone program is regulated by the Substance Abuse and Mental Health Services Administration. Methadone is only to be taken in compliance with the directives of a health provider. Doses of methadone are tailored for individuals. The doses are given and adjusted with time, depending on the response of the program enrollee. The doses may not be shared between patients because only the exact, needed dose is given to each patient.