Average

#163 of 399 private schools in MO

Top 41% of private schools

Mary Institute & St Louis Country Day School

School

101 N WARSON RD, St. Louis, MO 63124

Last updated: July 2026

Private

Enrollment

1,225

Student-Teacher

9.8:1

Score

6.7

Grades

Pre-K – 12th

Enrollment

1,225

Student-Teacher

9.8:1

Score

6.7

Grades

Pre-K – 12th

Data vintage
2021-22

Data vintage2021-22

How this school compares

Missouri private schools

#163 of 399

In St. Louis

#42 of 74

public schools

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About Mary Institute & St Louis Country Day School

Mary Institute & St Louis Country Day School is a private school in St. Louis, MO. Mary Institute & St Louis Country Day School serves approximately 1,225 students, and covers grades Pre-K-12th, and has a 9.8:1 student-teacher ratio.

Mary Institute & St Louis Country Day School has a current MySchoolScout rating of 6.7 out of 10 and ranks #163 of 399 private schools in MO.

How it compares0.4 pts above MO schools

6.7

This school 6.7 · Average
MO avg 6.3

What Parents Should Know

At 9.8:1 students to teachers, Mary Institute & St Louis Country Day School sits well below the national average. Smaller classes like that usually mean more one-on-one time between students and teachers.

Mary Institute & St Louis Country Day School is private, so it runs independently of the local district and sets its own curriculum. That freedom cuts both ways depending on what you want for your child. If you're considering it, start with the practical questions: tuition, financial aid, and how admissions work.

Compare to Public Schools

Beta

How Mary Institute & St Louis Country Day School compares to 203 public schools serving similar grades in St. Louis, MO

Student-Teacher Ratio

9.8:1

This School

14.3:1

Public Avg

Avg School Size

1,225

This School

394

Public Avg

Avg School Scout Rating

6.7

This School

5.6

Public Avg

Student Demographics

White 59.5% vs 0%

Asian 22.1% vs 0%

Black 7.6% vs 0%

Hispanic 1.1% vs 0%

Mary Institute & St Louis Country Day School St. Louis Public Avg

Nearby Other Schools

School	Distance	Enrollment	STR	Rating
Mary Institute & St Louis Country Day School (this school)	—	1,225	9.8:1	6.7
OLD BONHOMME ELEMENTARY	0.9 mi	391	12.2:1	8.1
SPOEDE ELEMENTARY	1.1 mi	381	12.7:1	8.3
LADUE HORTON WATKINS HIGH	1.3 mi	1,325	14.1:1	7.8
CONWAY ELEMENTARY	1.3 mi	414	13.4:1	8.2
LADUE EARLY CHILDHOOD CENTER	1.3 mi	232	—:1	3.0
LADUE FIFTH GRADE CENTER	1.3 mi	322	11.9:1	9.0
LADUE MIDDLE	1.3 mi	1,033	13.6:1	7.7
REED ELEMENTARY	1.8 mi	384	12.4:1	9.0
IVELAND ELEM.	2.5 mi	414	12.5:1	4.5
CRAIG ELEM.	3.0 mi	415	13.8:1	5.1
WYLAND ELEM.	3.3 mi	518	14.8:1	3.6
MARION ELEM.	3.5 mi	490	14:1	4.6
HUDSON ELEM.	3.6 mi	187	9.8:1	8.1
ROSS ELEM.	3.7 mi	389	12.2:1	7.7
DR. HENRY GIVENS JR. ELEM.	4.0 mi	289	12.6:1	5.3
RITENOUR MIDDLE	4.1 mi	758	15.8:1	6.3
WASHINGTON ELEM.	4.1 mi	332	23.7:1	4.2
RITENOUR SR. HIGH	4.2 mi	2,033	20.3:1	2.8
MCKELVEY PRIMARY	4.4 mi	219	12.2:1	6.5
NORTH HIGH	4.5 mi	1,013	13.9:1	7.1

Showing 20 of 203 schools. View all schools in St. Louis

Demographics sourced from NCES Private School Survey (PSS) and Common Core of Data (CCD). Comparisons are based on enrollment-weighted averages.

Score Breakdown

Preliminary

What This Rating Measures

This rating reflects classroom size, instructional time, student diversity, community resources, and school characteristics. Private schools are ranked against other private schools in MO.

Classroom Attention

B+ 7.0 / 10

View breakdown

Student-Teacher Ratio 9.8:1

Instructional Commitment

B 6.1 / 10

View breakdown

School Day Length 7.2 hours

Annual Instructional Hours 1,224

Diversity & Inclusion

A+ 9.6 / 10

View breakdown

Diversity Index 58%

Community Context

Data Unavailable

School Profile

C 2.6 / 10

View breakdown

Enrollment 1,225

View data sources

Score basis: Private school model

Data coverage: 80% of scoring components had data

Components scored: 4 of 5

Ranking pool: Private schools in MO

Test Scores

Test score data not yet available for this school.

Student Demographics NCES PSS (SY 2021-22)

White 59.5%

Asian 22.1%

Two or More 9.6%

Black 7.6%

Hispanic 1.1%

Native American 0.1%

Source: NCES Private School Survey (PSS)

Location

101 N WARSON RD, St. Louis, MO 63124

Nearby Alternatives

Families considering Mary Institute & St Louis Country Day School may also want to explore other schools in the area. VILLA DUCHESNE & OAK HILL SCHOOL (rated 8.5/10, 1.5 miles away), which scores notably higher. Additionally, HILLCREST SDA SCHOOL (rated 5.2/10, 1.4 miles away, in nearby Olivette), a more accessible option. For more schools in St. Louis, see our St. Louis schools guide .

Nearby Schools

20 within 2.0 mi

School	Distance	Enrollment	Rating
OLD BONHOMME ELEMENTARY St. Louis	0.9 mi	391	8.1
CHAMINADE COLLEGE PREP SCHOOL St. Louis	0.8 mi	836	7.0
IMMANUEL LUTHERAN SCHOOL Olivette	1.1 mi	113	6.5
LADUE HORTON WATKINS HIGH St. Louis	1.3 mi	1,325	7.8
CONWAY ELEMENTARY St. Louis	1.3 mi	414	8.2
HILLCREST SDA SCHOOL Olivette	1.4 mi	40	5.2
LADUE MIDDLE St. Louis	1.3 mi	1,033	7.7
SPOEDE ELEMENTARY St. Louis	1.1 mi	381	8.3
MIRIAM ACADEMY St. Louis	1.5 mi	67	7.2
LADUE EARLY CHILDHOOD CENTER St. Louis	1.3 mi	232	3.0
LADUE FIFTH GRADE CENTER St. Louis	1.3 mi	322	9.0
VILLA DUCHESNE & OAK HILL SCHOOL St. Louis	1.5 mi	371	8.5
ANNUNZIATA SCHOOL St. Louis	1.6 mi	28	—
WILLOW BROOK ELEM. Creve Coeur	1.9 mi	440	5.0
LOGOS SCHOOL Olivette	1.8 mi	113	9.0
REED ELEMENTARY St. Louis	1.8 mi	384	9.0
LITZSINGER Ladue	2.4 mi	82	3.5
HARPER SCHOOL, LLC Frontenac	2.2 mi	7	—
ST JOSEPH'S ACADEMY St. Louis	2.4 mi	529	6.4
COMMUNITY SCHOOL St. Louis	2.0 mi	295	8.1

Neighborhood Census ACS (2019-2023)

Census data for ZIP 63124 (ACS 2019-2023 5-Year Estimates) · Data sources

Median Income

$188,750

Median Home Value

$967,300

Median Rent

$1,812/mo

Population

11,009

College Educated

85%

Homeownership

74.8%

Poverty Rate

2.3%

Median Age

47.6

Similar Schools

Schools in the same state with comparable level, size, and ratings

School	Enrollment	Rating
MOCAP Attendance Center Springfield, MO	885	6.9
THE BARSTOW SCHOOL Kansas City, MO	850	6.9
THE PEMBROKE HILL SCHOOL - WORNALL CAMPUS Kansas City, MO	1,039	7.0

Frequently Asked Questions

Common questions about Mary Institute & St Louis Country Day School

What grades does Mary Institute & St Louis Country Day School serve?

Mary Institute & St Louis Country Day School serves students in grades Pre-K through 12th.

How many students attend Mary Institute & St Louis Country Day School?

Mary Institute & St Louis Country Day School has an enrollment of approximately 1,225 students.

What is the student-teacher ratio at Mary Institute & St Louis Country Day School?

The student-teacher ratio at Mary Institute & St Louis Country Day School is 9.8:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.

How does Mary Institute & St Louis Country Day School rank in MO?

Mary Institute & St Louis Country Day School ranks #163 of 399 private schools in MO.

What is Mary Institute & St Louis Country Day School's MySchoolScout rating?

Mary Institute & St Louis Country Day School has a current MySchoolScout rating of 6.7 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.

Is Mary Institute & St Louis Country Day School a private school?

Yes, Mary Institute & St Louis Country Day School is a private coeducational school with a Nonsectarian affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.

Is Mary Institute & St Louis Country Day School a religious school?

No, Mary Institute & St Louis Country Day School is a nonsectarian (non-religious) private school.

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Neighborhood Context

Walk Score: 6 Car-Dependent
Bike Score: 18 Somewhat Bikeable

Quick Facts NCES PSS (SY 2021-22)

Grades: Pre-K – 12th
Enrollment: 1,225
Gender Split: 52% M / 48% F
Student-Teacher Ratio: 9.8:1
Teachers (FTE): 125
Type: private
Coed Status: coed
Affiliation: Nonsectarian
School Day: 7.2 hours
Days Per Year: 170 days
Setting: Large Suburb
County: St. Louis County
Phone: (314) 995-7448

Resources & Links

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Data sources

NCES PSSSY 2021-22 Census ACS2019-2023 MySchoolScout Rankings2024 Full details →

Mary Institute & St Louis Country Day School

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