All the data comes from the Censuses of Religious Bodies, conducted by the US Census Bureau in 1906, 1916, 1926, and 1936. All but the 1926 Census are fully digitized and available online (the ’26 Census is, as best I can tell, only partially digitized). However, you can see the ’26 data (as well as data from ’06 and ’16) in the 1936 Census, which you can access by clicking here. The different years are available on various websites — the Census Bureau site, Google Books, and the Internet Archive (archive.org), I think.

Matthew

I’d love to see the actual data.

Have you published it somewhere that i’m not seeing?

Thanks
Dean Calvert