Founded in 1859, MICDS is a nonprofit, independent, preparatory school offering non-sectarian education to qualified students regardless of national origin, race or religion.
MICDS consists of the Ronald S. Beasley Lower School, for grades JK-4; Middle School, offering a coordinate model of single-sex education in the core curricular classes, for students in grades 5-8; and the Upper School for grades 9-12.
MICDS is recognized as one of the nation's leaders in independent education.
More than ever our nation needs responsible men and women who can meet the challenges of this world with confidence and embrace all its people with compassion.
The next generation must include those who think critically and resolve to stand for what is good and right.
Our school cherishes academic rigor, encourages and praises meaningful individual achievement, and fosters virtue.
Our independent education prepares young people for higher learning and for lives of purpose and service.
Quick Stats (2025)
- Top Ranked MO School
- Grades: Prekindergarten-12
- Enrollment: 1,241 students
- Yearly Tuition: $24,600
- Average class size: 16 students
- Application Deadline: Jan. 16
- Source: Verified school update
Top Rankings
Mary Institute & St. Louis Country Day School ranks among the top 20% of private schools in Missouri for:
Category
Attribute
ACT Score
Student Body
Sports offered
School History
School Overview
School Membership(s)School Assoc.
Religious Affiliation
Grades Offered
Grades Prekindergarten-12
Year Founded
1859
Summer School Offered
Yes
School Motto
Changing the lives of students so that they can change the world.
School Mascot
Ram
Student Body
Total Students
1,241 students
Student Body Type
Co-ed
% Students of Color
34%
State avg.: 20%
Students by Grade

Academics and Faculty
Total Classroom Teachers
125 teachers
Student : Teacher Ratio
10:1
National avg.: 13:1
% Faculty w/Advanced Degree
71%
Average Class Size
16 students
Advanced Courses
AP AB Calculus, AP Art History, AP BC Calculus, AP Biology, AP Chemistry, AP Environmental Science, AP European History, AP Language and Culture: Chinese, AP Language and Culture: French, AP Language and Culture: German, AP Language and Culture: Spanish, AP Latin, AP Music Theory, AP Physics C: Electricity and Magnetism, AP Physics C: Mechanics, AP Statistics, AP US Government
Average SAT score
1370
(Out of 1600)
Average ACT score
29
(Out of 36)
Classroom Dress Code
Casual
School Colors
Forest Green, Cardinal
Tuition and Acceptance Rate
Admission Deadline
Jan. 16
Yearly Tuition Cost
$24,600
Tuition Notes
JK - 4th grade tuition = $18,200
5th - 6th gr tuition = $21,300
7th - 12th grade tuition = $24,600
Lunch and laptop included in tuition
% on Financial Aid
23%
Admissions Director
Peggy B. Laramie
Application URL
Sports
Total Sports Offered
20 sports
Sports
School Notes
- Founded in 1859, MICDS is a nonprofit, independent, preparatory school offering non-sectarian education to qualified students regardless of national origin, race or religion. MICDS consists of the Ronald S. Beasley Lower School, for grades JK-4; Middle School, offering a coordinate model of single-sex education in the core curricular classes, for students in grades 5-8; and the Upper School for grades 9-12. MICDS is recognized as one of the nation's leaders in independent education. More than ever our nation needs responsible men and women who can meet the challenges of this world with confidence and embrace all its people with compassion. The next generation must include those who think critically and resolve to stand for what is good and right. Our school cherishes academic rigor, encourages and praises meaningful individual achievement, and fosters virtue. Our independent education prepares young people for higher learning and for lives of purpose and service.
Source: Verified school update
Frequently Asked Questions
How much does Mary Institute & St. Louis Country Day School cost?
Mary Institute & St. Louis Country Day School's tuition is approximately $24,600 for private students.
What sports does Mary Institute & St. Louis Country Day School offer?
Mary Institute & St. Louis Country Day School offers 20 interscholastic sports: Baseball, Basketball, Cheering, Crew, Cross Country, Cycling, Dance, Diving, Field Hockey, Football, Golf, Ice Hockey, Lacrosse, Soccer, Squash, Swimming, Tennis, Track and Field, Volleyball and Wrestling. Mary Institute & St. Louis Country Day School is ranked as one of the top 20% of private schools in Missouri for most sports offered.
What is Mary Institute & St. Louis Country Day School's ranking?
Mary Institute & St. Louis Country Day School ranks among the top 20% of private schools in Missouri for: Highest average ACT score, Largest student body, Most sports offered and Oldest founding date.
When is the application deadline for Mary Institute & St. Louis Country Day School?
The application deadline for Mary Institute & St. Louis Country Day School is Jan. 16.
School Reviews
5 5/17/2016
I received a very solid education from this school. I began attending in JK (Junior Kindergarten) and graduated after 14 years there. Now that I''m in college, I can look back and say MICDS prepared me incredibly well for the challenges I''m beginning to face. I grew up in a school that exposed me to different cultures, gave me incredible opportunities to grow, and had teachers that were flexible and excited to teach every day.
And on top of that, they don't accept anything less than your best. I was challenged constantly and, despite being shy, never felt like my opinion was unwelcome. I found my voice at MICDS and I would highly recommend it to anyone searching for a private school in St. Louis who wants a school focused on community and excellence.
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