Map of U.S. Dialects Amazing Map of All of America's Dialects
See the regional peculiarities of how people speak where you live, and across the country
This amazing map (large, readable version here) purports to show every North American dialect. It seems to hang a lot on how people pronounce the word "pen" and whether they drop their Rs.
Play around with the bigger version and see if its correct about the way people talk where you live.