Overall, the Boston-to-Washington coastal corridor takes the cake in the rankings, as it is home to 50 million people concentrated in a fairly small for the American standards area. Carriers have been saturating it for years with towers and upgrades, so it is no wonder that the northeastern states are ahead in the download game. Every state in the Eastern Seaboard and the mid-Atlantic region (except Ohio) averaged 20+ Mbps downloads.
On the other hand, states with more dispersed and rural population sit at the bottom of the table yet the two Dakotas, for instance, sit very well both in the download and the upload rankings. Check out where your state ranks overall in the maps and charts below.