Catholicism is the second largest religious tradition in the United States at roughly 25% of the country's population. The five most Catholic states in the U.S., according to a recent Gallup survey, are all on the East Coast: Rhode Island, New Jersey, Massachusetts, Connecticut and New York. The least Catholic states are mostly in the South.
Rhode Island's population is 54% Catholic, more than twice the national average. As Gallup notes, the most Catholic states tend to be the least Protestant states, and vice versa.
Here are the most and least Catholic states in the U.S.: