US religious maps

I'm a bit busy and behind my email and this blog, but I did notice an interesting collection of maps on American religious affiliation, by county. It doesn't cover all religions; it is mostly Christian denominations, with other major religions not subcounted by subsect.

I have no reason to suspect that if your religion was left off, it was for a more nefarious reason than that the small percentages around the country don't add up to an interesting map. So, there's no Baha'i, no Sikh, no Hindu (which surprised me), no Buddhist (another surprise), no Shinto, etc. The page indicates that the maps were also selected for interesting regional patterns (e.g., the map of Baptists, which is concentrated in the South, or the map of Mormons, which is concentrated on Utah). The Baptist church my family goes to doesn't even register as a blip in Northern Utah's Cache County, so don't feel slighted.

I guess the maps are out of a larger book which goes into the finer detail. The data are from large church bodies which are in some sense self-selecting, as explained here. So take with a grain of salt.