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State

Opioid treatment programs (methadone clinics) in Illinois

136 treatment centers. Facilities SAMHSA lists as an opioid treatment program (OTP) or as a federally certified opioid treatment program. Certified OTPs are the programs allowed to give methadone for opioid use disorder; many also offer buprenorphine or naltrexone.

City lists

All 136 in Illinois

Common questions

Opioid treatment programs (methadone clinics) in Illinois: how many are there?

SAMHSA’s FindTreatment.gov directory lists 136 treatment centers in Illinois that match (17% of the 802 listed in the state). Facilities SAMHSA lists as an opioid treatment program (OTP) or as a federally certified opioid treatment program. Certified OTPs are the programs allowed to give methadone for opioid use disorder; many also offer buprenorphine or naltrexone.

Which cities in Illinois have the most?

Chicago (47), Springfield (5), Cicero (4), Joliet (4) and Peoria (4).

Source: SAMHSA, FindTreatment.gov (National Directory of Mental Health and Substance Use Treatment Facilities), retrieved 2026-11-11. SAMHSA publishes no separate release date for this live directory. The directory has no quality ratings, and this list is not a ranking or a recommendation. Methodology