St. Mary's School
Diocesan school · Grades 6–12
Storm Lake, IA
312 Seneca St, Storm Lake, IA 50588
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A+Class size
- A-College-going
- B+Years serving families
- A+Diversity
What stands out
- Smaller classes than 95% of Catholic schools in Iowa
- One of the most diverse private schools in Iowa
St. Mary's School is a Catholic diocesan school in Storm Lake, Iowa, for students from 6th grade through 12th grade. It has about 103 students and around 7 students per teacher, smaller classes than 95% of Catholic schools in Iowa. The school is part of the Diocese of Sioux City. The school reports that about 83% of its graduates go on to four-year colleges. Students attend about 7 hours a day, 172 days a year. Iowa has programs that can help pay tuition; ask the school whether it takes part.
At a glance
- Grades
- Grades 6–12
- Students
- 103
- Teachers
- 14.4 (full-time equivalent)
- Students per teacher
- 7.2
- Boys and girls
- Coed · 53 girls, 50 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Diocese of Sioux City
- School day
- About 7 hours
- School year
- 172 days
- Graduates going to 4-year colleges
- About 83% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Smaller classes than 95% of Catholic schools in Iowa (7 students per teacher).
- A smaller school: fewer students than 100% of Catholic schools in Iowa.
- Compared with 21 Catholic schools in Iowa.
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 Iowa
These state programs can help pay private school tuition. Only participating schools can accept them, so ask St. Mary's School whether it takes part.
- Students First Education Savings Accounts · Education savings account
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. Mary's School
What grades does St. Mary's School serve?
St. Mary's School serves grades 6–12.
How many students attend St. Mary's School?
About 103 students, with 7 students per teacher, according to official records.
How much is tuition at St. Mary's School?
Call the school to ask about tuition, financial aid and payment plans. Iowa 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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