St. Louis De Montfort may be the largest Catholic church in the Miller Place-Rocky Point area, with nearly 5,000 parishioners. The church offers family and marriage counseling, religious education services and hosts reading groups, along with operating a preschool for 3 and 4 year olds. Founded in 1948, the church also provides babysitting services for children during Sunday's 9am mass and supports several music and choir groups.