Lassen County covers 4,690 square miles and that is a lot of territory. Not only that, is the diversity of terrain. With that in mind here is a little bit of trivia. The highest point in Lassen County is that of Hat Mountain in the northeast corner of the county at an elevation of 8,737 feet. The lowest point which is in the northwest portion of the county is Pittville on the Lassen-Shasta County line at an elevation of 3,270 feet.