For each audio snippet, we first computed the average error rate across the five ASR services we consider: Amazon, Apple, Google, IBM, and Microsoft. These average WERs were then grouped by interview location, with the distributions summarized in the boxplots above. In the three AAVE sites, denoted by a gray background (Princeville, NC; Washington, DC; and Rochester, NY), the error rates are typically higher than in the two white sites (Sacramento, CA, and Humboldt, CA), although error rates in Rochester are comparable to those in Sacramento.