Boarding students also have evening study hall. There are 54 students enrolled in the Middle School. Through the English Second Language program and the Study Abroad Program, Saint John's Prep maintains an international position. This year, there are 42 international students from thirteen countries living on campus. U.S. boarders come from states across the country, including Alaska, Idaho, California, Montana, Arizona, Texas, North Carolina, and the Midwest states.
Day students come from fourteen local school districts.
Approximately 35 percent of the students are not Catholic. Students of Saint John's Preparatory School have common expectations and rights that deserve mutual support. These expectations and rights include physical safety, honesty, protection of physical and mental health, and an orderly environment in which to pursue the goals that bring St. John's together as a school community. In order to protect the rights of all members of the Prep community and to establish and maintain an orderly environment for the pursuit of goals that are consonant with the philosophy of the School, rules have been established and are published in the student handbook. Disciplinary action for major offenses is carried out by the Dean of Students, working in conjunction with the Student Conduct Board.