Wicca is a huge part of the culture in Vermont and Massachusetts.
WTF?
In a 2001 study only 2% of Vermonters identified as part of "Other Religion" which would include Wicca. In 2008 that was up to 4%, but with such small numbers MoE alone could account for that. And not all of that is Wiccan. The last such survey also had Massachusetts as 7% "Other", which I'm sure not even a majority is anywhere near Wiccan. Wicca isn't a major part of the culture ANYWHERE in the US.
I have a feeling that a larger percentage, especially people who claim to be spiritual but not religious, might dabble in Wicca/witchcraft or go through goth phases as teenagers, but of course that's far from actually believing in Wicca or accepting all the religion's teachings. It's also entirely possible that some Evangelical Christians might be erroneously assuming that "spiritual but not religious" is actually a code-word for Wicca or witchcraft.
And no, Wicca isn't a major part of the culture anywhere in the U.S. It may be a major part of the counter-culture in some areas (ie in some high schools), but really Wiccans are a vocal, visible, but tiny minority without any real power or influence.