If you've traveled the US you know that dialects vary widely from place to place. Heck, living in NYC you experience the dialect shift from one end of a subway line to the other. Bay Ridge Brooklyn to Forest Hills Queens on the R line is but one example.
So I just LOVED these 22 maps that show the variance in the ways we pronounce common words across the United States. It's amazing how accurately the maps capture the way I learned to say things growing up in St. Louis. Check it out and see where you fall.