Slight detour, Part II: the same thing, but different

So after yesterday's look at the urban/rural divide and college education, I did the obvious and did the same scatterplot for high school.
That is kind of a messy scatterplot! And not just because I made it at 2 AM! Within the expected confines, there seems to be a lot of variation in these numbers, more so than there is with college graduation rates. There is also some regional clumping, as could also be expected.
But, perhaps due to the lateness of the hour...I am not coming up with any magic bullets for this data.