I'll dig it up bit a prof. From Nebraska studies dialects in the U.S. and he created a map w sample audio of about every dialect. It looks like a weather map w isobars. It's awesome.
There is great convergence of dialects here in the lower Midwest, Ohio River Valley which makes sense. I hear quite a bit of variance here in central IN.
The dialects in Maine are quite extreme, speaking of Queens and Old English.
My favorite Wisconsin expressionism, since most everybody knows about 'bubblers', 'I'm going to go over by Dave's house.' When you intend to go to Dave's house.
Runner up: 'borrow me $20'.