Do people in some parts of the country have better manners than people in other parts of the country?

This question occurred to me while reading the Mr. and Mrs. question. The question itself mentioned location as did some of the answers. Do you think people from some geographical areas raise their children with better manners? In my case I was raised in Southern California by a father who also grew up in So Cal and a mother from Chicago. Manners were a huge deal in our house; napkin on the lap, please and thank you, holding the door, Mr. and Mrs, etc., etc. As a rule, do you think any part of the US is more well mannered than any other part?