Importance: Many of the approximately 2 million people being held in US correctional facilities are experiencing an opioid use disorder (OUD). Providing medications for OUD (MOUD) to this population is, therefore, essential to curb the opioid crisis.

Objective: To examine the types of MOUD jails are making available, factors associated with availability, and additional supports needed for jails to address implementation challenges.

Design, Setting, and Participants: This survey study used a cross-sectional survey of jails conducted between February 2 and July 1, 2023, to explore how they administer MOUD. Publicly available county-level data were connected with the survey responses to assess how variables in the surrounding community were associated with MOUD availability. The survey was administered to jails via mail, telephone, and online survey link. Participants included jails with MOUD available that completed the survey.

Exposures: Urbanization, average daily population, availability of a health care professional to administer MOUD, whether the state expanded Medicaid, average drive time to MOUD in the county, county overdose rate, and county social vulnerability were assessed.

Main Outcomes and Measures: The primary outcome was the type of MOUD available in the jail, including buprenorphine, methadone, or naltrexone, or all 3 medications. Binary logistic regressions were conducted to identify the characteristics of jails and county-level factors associated with offering the medications.

Results: A total of 462 jails were invited to complete the survey based on responses to a previous nationally representative survey of jails, in which they indicated that MOUD was available to individuals in their facility. A total of 265 US jails with MOUD available were included in the analysis, representative of 1243 jails nationwide with MOUD available after weighting (812 jails [65.3%] provided buprenorphine, 646 jails [52.0%] provided naltrexone, 560 jails [45.0%] provided methadone, and 343 jails [27.6%] provided all 3 medications). Availability was associated with urbanicity, location in a Medicaid expansion state, county opioid overdose rate, and county social vulnerability. Common challenges included jail policies and procedures and the logistical accessibility of the medication.

Conclusions and Relevance: The findings of this survey study of US jails demonstrate that jails with MOUD available still experience challenges with making all 3 types of medication available to anyone held within their facility. Policy, regulatory, financing, staffing, and educational solutions are needed to ensure that all detainees with OUD have access to treatment while incarcerated.