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All these data come from the Association of Statisticians of American Religious Bodies, which conducts a U.S. Religion Census every 10 years. Here’s what their map of the second-most-practiced religions looks like:
And here’s the county-level map of second-largest religions after Christianity:
The data the ASARB release every 10 years are revealing: Adherents to any religious faith — that is, those who actually attend religious services — make up more than half the population in 28 states. Utah has the highest percentage of adherents, at 79 percent of the population, while just over a quarter of Mainers are adherents. North Dakota, Alabama and Louisiana are near the top of the list, while Oregon, Vermont, Alaska, Nevada and Washington sit near the bottom of the rankings.
Here’s their map of the largest religious denomination by county:
Catholicism dominates the Northeast and the Southwest, and Southern Baptists have a strong foothold in the South. The Church of Jesus Christ of Latter-day Saints dominates Utah and surrounding counties in Idaho, Wyoming and parts of Nevada. Lutheranism has a strong following in Minnesota and the Dakotas, while Methodists make their presence felt in parts of West Virginia, Iowa, Nebraska and Kansas.