The booklet also notes that since "the affiliation of the College Department with the University of Western Ontario in 1920, the High School has become a separate unit.

"[8][9] In the 1940s and early 50s the High School is stated to have resided in Dillon Hall[10][11] (the latter still in existence on the property of the University of Windsor).

[15] The Assumption College High School Chapel is listed on the Municipal Register but is not designated.

In 2011, one of the school's former teachers, Father William Hodgson Marshall, pled guilty to sexually abusing students while teaching at Assumption.

[17] Assumption offers a range of secondary programs including the IB Diploma Programme, as well as Co-op, OYAP, MOYAP, SHSM Hospitality and Tourism and SHSM Aviation and Aerospace.