User blog comment:TheMagicalWonders/Population of the Walls/@comment-27938131-20180902153939/@comment-30473998-20180905221925

Yes, lol. I also found a Reddit post that helpfully calculated the area of basically all of the walls: https://www.reddit.com/r/ShingekiNoKyojin/comments/1iqf8c/exactly_how_big_are_the_areas_protected_by_the/.