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The state with highest percentage Catholic is Rhode Island, at 53%, followed by Massachusetts, Connecticut, New Jersey, and New York. Two Midwestern states, Wisconsin and Illinois, are also in the top 10 states in terms of the percentage Catholic. States with higher percentages of Hispanic residents, including California and New Mexico, are above average in the proportion of their residents who are Catholic. Louisiana, home to immigrating French Canadians (Cajuns) several centuries ago, also has an above-average Catholic population.
The 10 states with the lowest percentages of Catholics are all in or close to the South, with the exception of Utah (with its high concentration of Mormons). Mississippi, with a 6% Catholic population, has the lowest proportion of Catholics of any state . . . .Gallup Poll (Click for information on Protestants, Jews, Mormons and "None")