Principia School (Top Ranked Private School for 2026-27)

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About the School

From infancy through grade 12, your child's educational journey at Principia is guided by those who believe in boundless possibility.
More than a college-prep day and boarding school in St. Louis, Principia is founded on Christian Science principles that view each student as limitless and divinely whole.
Here, students grow through character education and experiential learning-uncovering natural strengths, developing critical thinking skills, and realizing their full potential.
Our 360-acre campus in Town and Country provides immersive indoor and outdoor spaces where curiosity thrives and creativity takes flight.
Above all, Principia students learn what it means to live with purpose.
You'll see the difference everywhere you look-from innovative, future-ready learning inside and outside the classroom, to a spirit of inclusivity and sportsmanship that defines our community.
Principia welcomes students of all faith backgrounds.

Quick Facts (2026-27)

Top Ranked MO School
Grades: Prekindergarten-12
Enrollment: 477 students
Yearly Tuition: $24,040
Average class size: 14 students
Application Deadline: Apr. 1 / Jun. 3
Source: ✓Verified school update

School Rankings

Principia School ranks among the top 20% of private schools in Missouri for:

School Facts

Religious Affiliation

Other

Grades Offered

Grades Prekindergarten-12

Students By Grade

View Data

Distribution of Students By Grade
Grade	Principia School
Pre-K	78
Kind	19
1	16
2	11
3	21
4	25
5	29
6	27
7	39
8	27
9	35
10	40
11	52
12	58

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Year Founded

1898

Student Body

Total Students

477 students

Student Body Type

Co-ed

Academic Profile

Total Classroom Teachers

69 teachers

Student-Teacher Ratio

7:1

National avg.: 11:1

% Faculty w/Advanced Degree

64%

Average Class Size

14 students

Average SAT score

1200

(Out of 1600)

Average ACT score

(Out of 36)

Classroom Dress Code

Formal

Number of AP Courses

12 courses

List of Courses Offered

Link to List of Courses

School Membership(s)School Assoc.

National Association of Independent Schools (NAIS)
Other school association(s)

Tuition & Financial Aid

Admission Deadline

Apr. 1 / Jun. 3

Yearly Tuition Cost

$24,040

View national tuition avg.

Tuition Notes

Tuition varies by level and day vs. boarding.

% on Financial Aid

49%

Admissions Director

Ginger Roth

Admissions Associate

Jordan Poznick

Sports

Total Sports Offered

14 sports

Sports

BaseballBasketball

CheeringCross Country

DanceDiving

Flag FootballFootball

SoccerSwimming

TennisTrack and Field

VolleyballWrestling

Extracurriculars

Total ExtracurricularsTotal Extra-curric.

13 extracurriculars

ExtracurricularsExtra-curric.

Club or Organization:

Chess ClubDebate Club

Lesbian/Gay/TransgenderMock Trial

Running ClubTelevision/Radio

World Language Club

Arts and Music Programs:

ChoirDance

DrumlineImprove Club

Jazz Band

Recreational Athletic Programs:

Cheer

School Notes

Principia School is a place where students thrive and possibilities unfold-where students are challenged to grow in character and scholarship, embracing opportunity and pursuing excellence in a supportive and inclusive environment.
Located in Town and Country, Missouri, Principia School is an independent, coeducational college preparatory school offering innovative programs for preschool through grade 12. A beautiful 360-acre campus supports a state-of-the-art educational and athletic experience, featuring outstanding sports fields and facilities, and 100+ acres of outdoor teaching spaces. Grounded on the principles of Christian Science, Principia welcomes students from a variety of faith backgrounds who value a Christian-based approach to character development and education.
Through an integrated curriculum defined by rigor, challenge, and opportunity, students apply critical thinking and problem-solving skills to global challenges. A Principia education teaches students to think fearlessly, live selflessly, and learn purposefully while helping them gain an understanding of the wider world and how to improve it. Experiential learning opportunities abound both on campus and beyond through local, national, and international educational trips.
Learner-centered programs prepare students to succeed in an ever-changing world by forging deeper connections through authentic learning experiences, developing and strengthening character, and cultivating future-ready skills in preparation for college and beyond.

Source: Verified school update

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Frequently Asked Questions

How much does Principia School cost?

Principia School's tuition is approximately $24,040 for private students.

What sports does Principia School offer?

Principia School offers 14 interscholastic sports: Baseball, Basketball, Cheering, Cross Country, Dance, Diving, Flag Football, Football, Soccer, Swimming, Tennis, Track and Field, Volleyball and Wrestling. Principia School is ranked as one of the top 20% of private schools in Missouri for most sports offered.

What is Principia School's ranking?

Principia School ranks among the top 20% of private schools in Missouri for: Largest student body, Most sports offered and Oldest founding date.

When is the application deadline for Principia School?

The application deadline for Principia School is Apr. 1 / Jun. 3.

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Did You Know?

The average private school tuition in Saint Louis, MO is $17,419 for elementary schools and $21,551 for high schools (read more about average private school tuition across the country).

The average acceptance rate in Saint Louis, MO is 81% (read more about average acceptance rates across the country).