Is St. Louis County biggest east of Mississippi River?

Is St. Louis County biggest east of Mississippi River?

DULUTH — Every resident here has a favorite local brag. Duluth is on the world's largest freshwater lake by surface area. It's North America's most inland seaport. It's located in the largest U.S. county, by area, east of the Mississippi River. Or is it? That last distinction, it turns out, rides on whether St. Louis County includes the area of Lake Superior immediately off Duluth's shore. If the answer is yes, St. Louis County prevails. If the …