  We present a nation-wide network analysis of non-fatal opioid-involved
overdose journeys in the United States. Leveraging a unique proprietary dataset
of Emergency Medical Services incidents, we construct a journey-to-overdose
geospatial network capturing nearly half a million opioid-involved overdose
events spanning 2018-2023. We analyze the structure and sociological profiles
of the nodes, which are counties or their equivalents, characterize the
distribution of overdose journey lengths, and investigate changes in the
journey network between 2018 and 2023. Our findings include that authority and
hub nodes identified by the HITS algorithm tend to be located in urban areas
and involved in overdose journeys with particularly long geographical
distances.
