The academy was primarily a boarding school. Students came from Illinois, the surrounding states, Texas, and Mexico. A few day students came from the Lisle area. In 1947 enrollment averaged 75 students. Enrollment grew from 120 in 1953 to 300 in 1958, and remained at that level until 1966. Day student enrollment also grew and in 1962 the academy stopped accepting boarding school students. By 1964, the last year in which boarding school students were enrolled, alumni had hailed from all US states, South America, France, Mexico, and Guam. Day students from 1964 to 1968 came from Lisle and the neighboring communities. Unlike St. Procopius Academy, Sacred Heart Academy offered a business curriculum from 1953 to 1966. Courses included shorthand, typewriting, and bookkeeping.