watch 01:24 The Loop (TV) Do you like this video? 13 Euclid Street is the address of Springfield's Mensa HQ. It takes its name from a Greek mathematician. It is also the last stop on the Springfield subway. Appearances Episode – "They Saved Lisa's Brain" Retrieved from "https://simpsons.fandom.com/wiki/13_Euclid_Street?oldid=829637" Categories: Homes American Locations Locations Season 10 locations Community content is available under CC-BY-SA unless otherwise noted.