Immaculate Conception High School has experienced the proverbial growth of the mustard seed. The present building represents the third stage of expansion in the school’s history. The pioneer days of Immaculate Conception High School date to September 1915, to the little red brick structure, which is still located on the property. Forty-five girls formed the nucleus of the student body.
The following year the students moved to the right wing of the Immaculate Conception Provincial House. (Present day: Kirby Hall which is part of Felician University) This was “home” for the high school for the next forty-one years. In May 1918, the school became affiliated with the Catholic University of America, Washington, DC.
In November 1923, the New Jersey State Department of Education approved the establishment of Immaculate Conception High School as a private secondary school. An increasing enrollment necessitated the construction of the present building. This school was blessed and dedicated on September 8, 1957, by the Most Rev. Thomas A. Boland, Archbishop of Newark.
In January of 1960, Immaculate Conception High School was accredited by the Middle States Association of Schools and Colleges and has maintained this status to the present day.
In 2009 the Province of Immaculate Conception of Lodi was dissolved of its governance to unite with over 800 Felician Sisters from seven other Provinces in North America to form one under the title of Our Lady of Hope. Under this new model the Sisters entrusted the care of all their Sponsored Ministries to a Chicago based company: Felician Services, Inc. Since this time, Immaculate Conception High School has a Mission Leader working with FSI to ensure the Felician Core Values are a lived experience in the life of the school and community.
The academic year 2014-2015 marked a much-celebrated year of the Centennial of the founding of Immaculate Conception High School.
In June of 2019, Immaculate Conception launched its strategic plan to ensure the success and growth of ICHS for years to come.