Quick Facts (2025-26)
- Grades: (ÂÌñÉç Students) 8-12
- Grades: (Day Students) PK-12
- Application Deadline: None / Rolling
- Source: Verified school update
Top Rankings
Principia School ranks among the top 20 boarding schools (out of 276 schools) for:
Category
Attribute
School Resources
School Overview
School Focus
College Preparatory
College Preparatory
Grades Offered (ÂÌñÉç)
8-12
9-12
Grades Offered (Day)
PK-12
2-12
School Type
Co-ed
Co-ed
Year Founded
1898
1907
Campus Size
360 acres
125 acres
Student Body
Offers Post-Grad Year
No
No
Academics and Faculty
Saturday Classes
Yes
No
Frequency of Saturday Classes
Weekly
Monthly
Tuition Cost
Endowment Size
$590 million
$30 million
Yearly Tuition
(ÂÌñÉç Students)
(ÂÌñÉç Students)
n/a
$68,800
Yearly Tuition
(Day Students)
(Day Students)
n/a
$37,600
Admissions
College Matriculation
College Acceptance Rate
96%
10 Most Popular College Choices (# Enrolled)
School Notes
- School Motto: As the sowing, the reaping
- School Mascot: Panther
Source: Verified school update
Frequently Asked Questions
What is Principia School's ranking?
Principia School ranks among the top 20 boarding schools for Large financial endowment.
When is the application deadline for Principia School?
The application deadline for Principia School is rolling (applications are reviewed as they are received year-round).
Nearby ÂÌñÉç Schools
The nearest boarding school to Principia School is Chaminade College Preparatory School (3.7 miles away)
School
Location
Miles
Quick Facts
Chaminade College Preparatory School![Chaminade College Preparatory School Photo - Chaminade is located 20 minutes outside of Downtown St. Louis in the lovely, safe, green neighborhood of Creve Coeur. Our 55 acre campus is fun and lively throughout the school year and a wonderful place not only to study and play but also to become part of the family.]( "Chaminade College Preparatory School Photo - Chaminade is located 20 minutes outside of Downtown St. Louis in the lovely, safe, green neighborhood of Creve Coeur. Our 55 acre campus is fun and lively throughout the school year and a wonderful place not only to study and play but also to become part of the family.")
(Catholic)
425 South Lindbergh Blvd.
St. Louis, MO 63131
(314) 692-6645
St. Louis, MO 63131
(314) 692-6645
3.7 miles
Gr: 6-12 | 800 students Student-teacher ratio: 9:1 Avg. class size: 17 students Tuition listed
4100 South Lindbergh Blvd.
Saint Louis, MO 63127
(314) 843-4151
Saint Louis, MO 63127
(314) 843-4151
7.4 miles
Gr: 7-12 | 88 students Student-teacher ratio: 6:1 Avg. class size: 15 students Acceptance rate: 70% Tuition listed
204 Grand Street
Mexico, MO 65265
(573) 581-1776
Mexico, MO 65265
(573) 581-1776
84 miles
Gr: 7-12, PG | 220 students Student-teacher ratio: 11:1 Avg. class size: 14 students Acceptance rate: 65% Tuition listed
804 Dr Robert K Wallace Drive
Fairfield, IA 52556
(641) 472-9400
Fairfield, IA 52556
(641) 472-9400
183 miles
Gr: 9-12 | PK-12 (day) | 184 students Student-teacher ratio: 5:1 Avg. class size: 12 students Acceptance rate: 70% Tuition listed
Saint Bede Academy![Saint Bede Academy Photo - With an average student population of 300, our small class sizes offer students one-on-one interaction with their instructors.]( "Saint Bede Academy Photo - With an average student population of 300, our small class sizes offer students one-on-one interaction with their instructors.")
(Catholic)
24 W US Highway 6
Peru, IL 61354
(815) 250-0285
Peru, IL 61354
(815) 250-0285
200 miles
Gr: 9-12 | 293 students Student-teacher ratio: 12:1 Avg. class size: 18 students Acceptance rate: 80% Tuition listed
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