Why does this make a difference?
Average annual income of workers 18 and over:
MS/PhD $74,602
BS/BA $51,206
HS $27,915
no HS $18,734
Nationally, the Northeast has the highest proportion of college graduates, the Midwest the highest proportion of high school graduates, and the South the lowest proportion of both.
From the US Census Bureau
Educational Attainment in the United States: 2003.