I took the quiz over at the New York Times and I’ve got to admit that its pegging of my dialect isn’t far from the mark. My bottom line results are illustrated on the map above.
I think I can see the complicating factors. I don’t have a “St. Louis A”. I have a number of Southernisms in my speech. For example, for me the plural of you is “y’all”. I have some Ozarkisms in my speech. And I have some Britishisms in my speech.
When my wife took the test it pegged her correctly as a Westerner but her most likely cities were Boise, Reno, and Salt Lake City, odd for a woman who spent her first twenty-two years in California—both Los Angeles and San Francisco, which itself might point to the result.