Principia School
Religious school · Grades Pre-K–12
Saint Louis, MO
13201 Clayton Rd, Saint Louis, MO 63131
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- ACollege-going
- B+Years serving families
- ADiversity
What stands out
- The largest of 36 private schools in Missouri
- 98% of graduates go to four-year colleges
- Small classes: about 8 students per teacher
- One school from pre-K through 12th grade
Principia School is a faith-based private school in Saint Louis, Missouri, for students from pre-K through 12th grade. It has about 423 students and around 8 students per teacher. Its enrollment has held steady since 2013–14. The school reports that about 98% of its graduates go on to four-year colleges. Students attend about 7.5 hours a day, 166 days a year. Missouri has programs that can help pay tuition; ask the school whether it takes part.
At a glance
- Grades
- Grades Pre-K–12
- Students
- 423
- Teachers
- 55 (full-time equivalent)
- Students per teacher
- 7.7
- Boys and girls
- Coed · 218 girls, 205 boys
- Religious affiliation
- Other religious
- School day
- About 7.5 hours
- School year
- 166 days
- Graduates going to 4-year colleges
- About 98% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
Students by survey year
Total students reported in official records since 2013–14.
Students by grade
Student body
Member of
- National Association of Independent Schools
- A state or regional independent school association
Help paying tuition in Missouri
These state programs can help pay private school tuition. Only participating schools can accept them, so ask Principia 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 Principia School
What grades does Principia School serve?
Principia School serves grades Pre-K–12.
How many students attend Principia School?
About 423 students, with 8 students per teacher, according to official records.
How much is tuition at Principia 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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