Distance to a facility. The geographic distance is calculated in miles using haversine equation between each ZIP code tabulation area (ZCTA) without a facility and the nearest ZCTA containing such a facility. County estimates are averages of the ZCTAs contained in that county. Syringe services program locations are taken from the North American Syringe Exchange Network (NASEN) and does not include programs that do not distribute syringes.

Based on analysis originally published at CROI: 220 Vulnerable Counties: One Year Later

Data Source: amfAR Analysis

Available at: http://opioid.amfar.org/indicator/num_SSPs