In its original American broadcast, "The Devil You Know" was seen by an estimated 2.21 million household viewers and gained a 0.9 ratings share among adults aged 18–49, according to Nielsen Media Research. This means that 0.9 percent of all households with televisions watched the episode. This was a 19% decrease in viewership from the previous episode, which was watched by 2.71 million viewers with a 1.1 in the 18-49 demographics.
