What is the largest cockroach on record? July 16, 2020 by Pamela Landy At 3.81 inches in length, this one could hardly check ‘ into a Roach Motel, much less check out. Related Answers What Kurt Vonnegut character invented ice-nine? What was the first American college football game? What is the largest bank robbery in the world on record? In Don Marquis’s “archy and mehitabel” stories, which is the cockroach and which the cat? Which baseball player holds the record for stealing home? Which ice hockey player holds the lifetime record for scoring goals?