Here is a map with one dot for every person in the U.S. and Canada according to U.S. and Canada census data. As the website state:
This is a map of every person counted by the 2010 US and 2011 Canadian censuses. The map has 341,817,095 dots - one for each person.And you can actually zoom in to see individual dots.
What I find fascinating is, starting at the splotch in Texas that I assume is San Antonio, you can almost follow a line north (a not quite straight line) to what looks like Winnipeg, Canada. East of that line there is almost no empty space and a lot of dark smudges. West of that, there's a lot of empty space and almost no smudges until you get to the West Coast/I-5 corridor.
I think a lot of people living in the crowded eastern half of the continent don't realize how much empty space there is out West.
And I think a lot of people living the the West don't realize how packed the people are in the East. We take our open spaces for granted. I can hope in my car, drive an hour, and be where you can't see anything human-built (except the road).
Anyway, fun map that somebody wasted a lot of time on.