Background: Post-overdose outreach programs have proliferated in response to opioid overdose. Implementing these programs is associated with reductions in overdose rates, but the role of specific program characteristics in overdose trends has not been evaluated.

Results: There were no significant associations (p < 0.05) between outreach contact rate, naloxone distribution, coercive practices, or harm reduction activities with municipal fatal overdose trends. Municipalities with programs providing or referring to more social services experienced 21% fewer fatal overdoses compared to programs providing or referring to more social services (Rate Ratio (RR) 0.79, 95% Confidence Interval (CI) 0.66–0.93, p = 0.01). Compared to municipalities in quarters when programs had no outreach contacts, municipalities with some, but less than the median outreach contacts, experienced 14% lower opioid-related emergency responses (RR 0.86, 95% CI 0.78–0.96, p = 0.01). Associations between naloxone distribution, coercive practices, harm reduction practices, or social services and opioid-related emergency responses were not consistently significant across modeling approaches.

Summary: Municipalities with post-overdose outreach programs providing or referring to more social services had lower fatal opioid overdose rates. Municipalities in quarters when programs outreached to overdose survivors had fewer opioid-related emergency responses, but only among programs with below the median number of outreach contacts. Social service linkage should be core to post-overdose programs. Evaluations should assess program characteristics to optimize program design.