 The largest denominations are the Roman Catholic Church with 456,598 adherents, the Episcopal Church with 19,377, the American Baptist Churches USA with 15,220, and the United Methodist Church with 6,901 adherents.Rhode Island has the highest proportion of Roman Catholic residents of any state, mainly due to large Irish, Italian, and French-Canadian immigration in the past; recently, significant Portuguese and various Hispanic communities have also been established in the state.Though it has the highest overall Catholic percentage of any state, none of Rhode Island's individual counties ranks among the 10 most Catholic in the United States, as Catholics are very evenly spread throughout the state.