Source? Let's hear it for Virginia!!
But these numbers don't surprise me, unfortunately. Nor does the fact that Episcopal churches are concentrated in the East and especially New England.
If there's data for Congregationalists, I'd assume they're almost completely exclusive to New England.
Isn't the UCC Congregationalist? They're all over the country.
The UCC is the result of mergers between other churches, and is itself a relatively new denomination, founded in 1957. My UCC college chaplain, who is now retired, was a member of one of those churches before the merger. But Congregationalists trace their lineage back to the Puritans, who basically established theocracy in the Massachusetts Bay Colony and that is where their oldest churches are. Obviously they haven't retained much of anything from their Puritan roots, except for elements of the Reformed ecclesiastical polity.
There is also a smaller conservative Congregationalist body (similar to say the relationship PCA has to PCUSA) known as the Conservative Christian Congregational Conference that adheres more closely to Puritan roots but whose geographic distribution is similar to the UCC. Interestingly, their headquarters is in Minnesota.
