Here's the map I was talking about (its 14 years old, but is probably still somewhat accurate:
Also, on the counties I just talked about, most of them have the "Reformed" christian church. Interesting
I see these maps in a lot of places, but is there ever going to be an updated version based on the 2010 Census?
And what percentage of self-identified Dutch-Americans are (still) Dutch Reformed?
In 2000 the largest ancestry was a question on the long form of the census. Now there is only a short form and questions like
ancestry are part of the American Community Survey (ACS) which comes out regularly with 1-year, 3-year, and 5-year totals. A third party would need to put together a map based on the county-by-county tables from the ACS.
The Census does not ask questions about religion, but that data is collected by the Association of Religious Data Archives (ARDA). They have
2010 data in map form, but it's only by state. There is county data in the GIS mapping tool for 2009. In either case there is no map that shows the largest denomination like the 2000 data does. One could construct it from the tables on their site.
