St. Dominic High School
Diocesan school · Grades 9–12
O'Fallon, MO
31 Saint Dominic Dr, O'Fallon, MO 63366
Overall grade: B-
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- B-Class size
- A-College-going
- A-Years serving families
- BDiversity
What stands out
- The largest of 188 Catholic schools in Missouri
- 94% of graduates go to four-year colleges
- Growing: enrollment up 63% since 2011–12
- Serving families in O'Fallon since at least 2011
St. Dominic High School is a Catholic diocesan school in O'Fallon, Missouri, for students from 9th grade through 12th grade. It has about 1,087 students and around 17 students per teacher. Enrollment has grown about 63% since 2011–12. The school is part of the Archdiocese of St. Louis. The school reports that about 94% of its graduates go on to four-year colleges. Students attend about 7 hours a day, 179 days a year. Missouri has programs that can help pay tuition; ask the school whether it takes part.
At a glance
- Grades
- Grades 9–12
- Students
- 1,087
- Teachers
- 64.9 (full-time equivalent)
- Students per teacher
- 16.7
- Boys and girls
- Coed · 580 girls, 507 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Archdiocese of St. Louis
- School day
- About 7 hours
- School year
- 179 days
- Graduates going to 4-year colleges
- About 94% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Larger than 96% of Catholic high schools in Missouri.
- Compared with 23 Catholic high schools in Missouri.
Students by survey year
Total students reported in official records since 2011–12.
Students by grade
Student body
Member of
- National Catholic Educational Association
Help paying tuition in Missouri
These state programs can help pay private school tuition. Only participating schools can accept them, so ask St. Dominic High School whether it takes part.
- MOScholars · Tax-credit scholarship
Questions to ask on a tour
- What is tuition, and what does it include (books, fees, uniforms, trips)?
- Do you offer financial aid, sibling discounts or payment plans?
- Do you accept ESA, voucher or tax-credit scholarship funds?
- How big are classes in my child's grade?
- What support is there for students who need extra help or more challenge?
- Is the school accredited, and by whom?
- What do a typical day and a typical week look like?
- How does the school communicate with families?
Questions about St. Dominic High School
What grades does St. Dominic High School serve?
St. Dominic High School serves grades 9–12.
How many students attend St. Dominic High School?
About 1,087 students, with 17 students per teacher, according to official records.
How much is tuition at St. Dominic High School?
Call the school to ask about tuition, financial aid and payment plans. Missouri has programs that can help pay private school tuition; ask whether the school takes part.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
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