This comes from the Barna Group. You can read more about it here.
Conducted by Barna Group, the study analyzes 96 geographic regions across the U.S. “We are continuously evaluating interaction with and views of the Bible among Americans,” said Geoffrey Morin, chief communications officer at American Bible Society. “Knowing the Bible landscape across the U.S. is key to helping people engage with the most-translated, best-selling book of all time. Whether you are living in the Bible Belt, the Midwest, New England or the Great Lakes, the Bible speaks to the needs, concerns and challenges of every American.”