TIL that the least densely populated county in the US east of the Mississippi River is Hamilton County, NY with 3 people/sq mi (1.2/km2).

https://en.wikipedia.org/wiki/Hamilton_County%2C_New_York
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gbj84w/til_that_the_least_densely_populated_county_in/