Quick Facts

St. Dominic High School is a Catholic, college preparatory school for young men and women in grades 9-12.

Enrollment: 1,028 students
History: Founded in 1929 as Assumption High School Learn more
Campus: 50 acres in O’Fallon, Missouri Learn more
Our community: Students from St. Charles, Lincoln, Warren and St. Louis counties
Student-teacher ratio: 14:1
ACT scores (Class of 2022 average): 31.75 (top 10%), 26.05 (top 50%), 22.17 (overall average)
After graduation: 95% of St. Dominic graduates continue to postsecondary studies
Accreditation: AdvancED


Jim Welby

Jim Welby


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