You can also really tell that Episcopalianism doesn't have much of a geographic base, as such, in this country. Traditionally it was the church of choice for upper- and upper-middle-class non-"ethnics", who are all over the place even today but aren't really a majority anywhere. (Note that the Episcopalian counties that are on this map are in places like Southwestern Connecticut and the ski-resort parts of the Mountain West.)
But not exclusively — the other part of the country that sticks out as heavily ECUSA is Pine Ridge & Rosebud. (There are eleven Episcopal congregations on the Rosebud reservation and only three in Sioux Falls.) Strange alliance of the richest 1% and the poorest 1%.
