Shit I think you're right on the money for North American cows. I actually thought up a bunch of examples I thought were midwestern because they had neutral accents but it turns out they well all Southern. This includes a good chunk of TGWTG and a few furries I remember from back in the day.My personal theory about cows is that they are the product of a weird concoction of poverty and subcultures that enable deviant behavior.
Here are my two case studies:
I don't think its surprising that we see these places as the center of weird ass cults (Jonestown in Cali, Waco in Texas) and dumb trends like anti-vax. These places are blast furnaces for exceptionalism.
I have a hard time listing cows from the east coast, midwest and prairies and I don't think that can be chalked up to population density.