It’s not all surprising, but some of this is shocking. This map from Adherents.com, shows us the largest denominations in each state after the Catholic Church is excluded. Catholicism which comprises about 25% of the US population is the largest single church in the country, that is, the Catholic Church has the largest plurality.
I would have guessed that the Baptists would be big in the old South. Lutherans being big in the upper MidWest cannot be a surprise to anyone who has listened to A Prairie Home Companion. And Mormons are big in the West–but California? Oregon? Washington State? Those missionaries are more effective than I would have thought.
I am surprised also that Methodism remains strong in the middle of the country. Back in the ’90’s when I was a grad student in Sociology of Religion, I remember reading that the UMC was the most national of US denominations (The Catholic Church is not a denomination, even by Sociology of Religion standards). But, Methodism has been losing ground fast since the mid-70’s.
Here is a map of the largest denomination in each state without the Catholics removed: