Visit School Website. Principal Prospectus 2025. The Archdiocese of Chicago, the third largest in the United States, serves more than 2.2 million Catholics in 216 parishes in Cook County and Lake county, a geographic area of 1,411 square miles. The Archdiocese, pastored by Cardinal Blase J. Cupich, has more than 13,000 employees in its systems and ministries, including Catholic Charities, the region's largest nonprofit social service agency. The ...
