In its original American broadcast, "Maximum Security" was seen by an estimated 2.71 million household viewers and gained a 0.9/3 ratings share among adults aged 18–49, according to Nielsen Media Research. This was a 34% increase in viewership from the previous episode, which was watched by 2.02 million viewers with a 0.9/3 in the 18-49 demographics. This means that 0.9 percent of all households with televisions watched the episode, while 3 percent of all households watching television at that time watched it. With these ratings, Brooklyn Nine-Nine was the second most watched show on FOX for the night, behind American Idol: American Dream, fourth on its timeslot and eleventh for the night, behind Agents of S.H.I.E.L.D., The Real O'Neals, Fresh Off the Boat, Limitless, The Voice, American Idol: American Dream, Chicago Med, Chicago Fire, NCIS: New Orleans, and NCIS.
