Unfortunately, it’s not like the Ivy League or the Pac-12. There’s no clear definition of which states are in the Bible Belt and which states are outside of it.
I nominate the following states: West Virginia, Kentucky, Tennessee, North Carolina, South Carolina, Georgia, Alabama, Mississippi, Louisiana, Arkansas, Missouri, Iowa, Texas, Oklahoma, Kansas, Nebraska.
Junior members: North Dakota, South Dakota, Indiana.
The following states are only partially in the Bible Belt: the southern part of Virginia, the southern part of Illinois, and the panhandle of Florida.
I welcome the opinions of others regarding which states may have been wrongly included and which states left out.
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The most common and leigitimate question raised in the comments is whether some of the more northern states I mentioned belong in the Bible Belt. I suppose that means the Dakotas, Nebraska, Iowa, southern Illinois, Indiana, and West Virginia.
It seems to me that these states give rise to a lot of Christian politicians, so there must be a lot of those type of people living there who vote those politicians into office. But I've never lived in the nothern midwest or the deep south, so I can't personally compare them.