Overview

Trends in Total Number of Private Schools

Year	St. Charles County Total Schools
2025	44
2024	45
2023	43
2022	44
2021	45
2020	49
2019	50
2018	50
2017	48
2016	47
2015	45

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Private schools down 3 in St. Charles County, from 47 in 2016 to 44 in 2025.

# Students

11,463 Students

119,606 Students

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Showing 2016–2025. View full 11-year historical data

Trends in the Average Number of Students Per Private School

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	300	194	179
2024	300	190	172
2023	288	185	174
2022	285	196	185
2021	278	192	180
2020	269	183	171
2019	290	184	175
2018	293	183	172
2017	289	190	180
2016	274	188	178
2015	288	180	167

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Private school size up 26 students in St. Charles County, rising from 274 in 2016 to 300 in 2025.

% Average Students of Color

21%

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Showing 2016–2025. View full 11-year historical data

Percentage of Students of Color Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	8%	20%	34%
2024	8%	21%	34%
2023	9%	20%	33%
2022	8%	18%	33%
2021	7%	18%	32%
2020	6%	19%	32%
2019	7%	18%	31%
2018	7%	18%	31%
2017	19%	21%	32%
2016	14%	21%	32%
2015	14%	20%	32%

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Students of color down 6 points in St. Charles County private schools, from 14% in 2016 to 8% in 2025.

Academics and Faculty:

# Teachers

775 Teachers

9,948 Teachers

Average Student-Teacher Ratio

15:1

12:1

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Showing 2016–2025. View full 11-year historical data

Student-Teacher Ratio Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	16:1	12:1	11:1
2024	16:1	12:1	11:1
2023	14:1	13:1	11:1
2022	14:1	13:1	11:1
2021	14:1	13:1	11:1
2020	16:1	13:1	12:1
2019	15:1	12:1	12:1
2018	15:1	13:1	12:1
2017	15:1	12:1	12:1
2016	15:1	12:1	12:1
2015	16:1	12:1	12:1

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Student-teacher ratio up 1 in St. Charles County private schools, from 15:1 in 2016 to 16:1 in 2025, while Missouri is 12:1 and the U.S. 11:1.

% Average Faculty w/Advanced Degree

57%

56%

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Showing 2016–2025. View full 11-year historical data

Percentage of Faculty With Advanced Degrees Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	57%	56%	55%
2024	57%	55%	54%
2023	61%	55%	54%
2022	60%	55%	54%
2021	58%	55%	54%
2020	65%	56%	54%
2019	63%	54%	53%
2018	63%	53%	53%
2017	63%	53%	53%
2016	60%	51%	52%
2015	60%	50%	52%

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Advanced degrees held near 57% in St. Charles County private schools in 2025, still higher than Missouri's 56% and the nation's 55%.

Average Class Size

18 students

16 students

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Showing 2016–2025. View full 11-year historical data

Class Size Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	17	15	15
2024	17	15	15
2023	17	15	15
2022	17	15	15
2021	17	15	15
2020	17	15	15
2019	18	15	15
2018	18	15	15
2017	18	15	15
2016	17	15	15
2015	17	15	15

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Average Number of AP Courses

12 courses

15 courses

Average ACT score

(Out of 36)

Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$8,278

$12,008

View Data

Showing 2016–2025. View full 11-year historical data

Tuition Cost Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	$8,228	$11,616	$13,694
2024	$8,102	$11,372	$13,340
2023	$7,933	$10,842	$12,825
2022	$7,505	$10,493	$12,321
2021	$7,423	$10,375	$12,072
2020	$7,317	$10,132	$11,784
2019	$7,212	$10,010	$11,547
2018	$7,183	$9,823	$11,280
2017	$7,162	$9,691	$10,994
2016	$7,140	$9,353	$10,614
2015	$6,546	$9,006	$10,195

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Tuition up 1,088 dollars in St. Charles County, from $7,140 in 2016 to $8,228 in 2025.

Average % on Financial Aid

21%

36%

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Showing 2016–2025. View full 11-year historical data

Percent on Financial Aid Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	21%	36%	34%
2024	21%	36%	34%
2023	20%	36%	34%
2022	21%	35%	33%
2021	22%	35%	33%
2020	19%	34%	32%
2019	16%	33%	31%
2018	16%	33%	30%
2017	16%	32%	30%
2016	18%	33%	29%
2015	19%	34%	28%

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Average Financial Aid Grant

$1,346

$5,725

Average Acceptance Rate

96%

89%

View Data

Showing 2016–2025. View full 11-year historical data

Acceptance Rate Trends (2015-2025)

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	96%	89%	85%
2024	96%	89%	85%
2023	93%	89%	85%
2022	93%	88%	85%
2021	93%	88%	85%
2020	96%	88%	85%
2019	96%	87%	85%
2018	96%	88%	85%
2017	96%	88%	85%
2016	95%	89%	85%
2015	96%	89%	85%

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Acceptance rate up 1 point in St. Charles County, from 95% in 2016 to 96% in 2025, while Missouri is 89% and the U.S. is 85%.

Students by Ethnicity:

0.49

0.55

View Data

Showing 2016–2025. View full 11-year historical data

Diversity Score Trends

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	0.49	0.55	0.65
2024	0.49	0.56	0.65
2023	0.49	0.54	0.65
2022	0.45	0.52	0.64
2021	0.43	0.52	0.64
2020	0.44	0.52	0.64
2019	0.44	0.50	0.63
2018	0.44	0.50	0.63
2017	0.40	0.46	0.61
2016	0.42	0.46	0.61
2015	0.40	0.45	0.61

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Diversity score up 7 points in St. Charles County private schools, rising from 0.42 in 2016 to 0.49 in 2025.

# American Indian Students

34 Students

283 Students

% American Indian Students

<1%

# Asian Students

207 Students

3,147 Students

% Asian Students

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Showing 2016–2025. View full 11-year historical data

Asian Student Percentage Trends

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	2%	4%	5%
2024	2%	4%	5%
2023	3%	3%	5%
2022	2%	4%	4%
2021	2%	3%	4%
2020	2%	3%	4%
2019	2%	3%	4%
2018	2%	3%	4%
2017	1%	2%	4%
2016	1%	3%	4%
2015	1%	3%	4%

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Asian enrollment up 1 point in St. Charles County private schools, from 1% in 2016 to 2% in 2025.

# Hispanic Students

174 Students

5,325 Students

% Hispanic Students

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Showing 2016–2025. View full 11-year historical data

Hispanic Student Percentage Trends

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	2%	5%	9%
2024	2%	4%	9%
2023	1%	3%	9%
2022	1%	3%	8%
2021	1%	3%	9%
2020	1%	3%	9%
2019	1%	3%	8%
2018	1%	3%	8%
2017	1%	2%	8%
2016	1%	2%	8%
2015	1%	2%	8%

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Hispanic share up 1 point in St. Charles County private schools, rising from 1% in 2016 to 2% in 2025.

# Black Students

278 Students

7,603 Students

% Black Students

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Showing 2016–2025. View full 11-year historical data

Black Student Percentage Trends

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	3%	6%	7%
2024	3%	7%	7%
2023	2%	7%	8%
2022	2%	6%	7%
2021	2%	7%	7%
2020	2%	7%	8%
2019	2%	7%	7%
2018	2%	7%	7%
2017	2%	7%	7%
2016	2%	7%	7%
2015	2%	7%	8%

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Black student share up 1 point in St. Charles County private schools, rising from 2% in 2016 to 3% in 2025.

# White Students

7,258 Students

73,073 Students

% White Students

66%

62%

View Data

Showing 2016–2025. View full 11-year historical data

White Student Percentage Trends

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	66%	62%	52%
2024	66%	62%	52%
2023	67%	64%	52%
2022	70%	66%	54%
2021	72%	66%	54%
2020	72%	66%	54%
2019	71%	68%	56%
2018	71%	68%	56%
2017	75%	71%	58%
2016	73%	71%	58%
2015	75%	72%	58%

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White share down 7 points in St. Charles County private schools, from 73% in 2016 to 66% in 2025.

# Hawaiian Students

19 Students

218 Students

% Hawaiian Students

<1%

# Others Students

3,024 Students

27,547 Students

% of Others Students

27%

24%

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Showing 2016–2025. View full 11-year historical data

Other Races Student Percentage Trends

Year	St. Charles County Average	Missouri (MO) Average	National Average
2025	27%	23%	26%
2024	27%	23%	26%
2023	27%	23%	25%
2022	25%	21%	25%
2021	23%	21%	25%
2020	23%	21%	24%
2019	24%	19%	24%
2018	24%	19%	23%
2017	21%	18%	22%
2016	23%	17%	22%
2015	21%	16%	21%

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Other-race share up 4 points in St. Charles County private schools, rising from 23% in 2016 to 27% in 2025.

All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

7 extracurriculars

10 extracurriculars

Average Number of Sports

8 sports

7 sports

Frequently Asked Questions

What are the top ranked private schools in St. Charles County, MO?

The private schools in St. Charles County, MO include Assumption School, Immaculate Conception School, and Immanuel Lutheran School.

How many private schools are located in St. Charles County?

44 private schools are located in St. Charles County.

How much do private schools cost in St. Charles County?

The average tuition cost is $8,278, which is lower than the Missouri private school average tuition cost of $12,008.

How diverse are private schools in St. Charles County?

St. Charles County private schools are approximately 9% minority students, which is lower than the Missouri private school average of 21%.

What percentage of students in St. Charles County go to private school?

16% of all K-12 students in St. Charles County are educated in private schools (compared to the MO state average of 12%).

What percentage of private schools are religiously affiliated in St. Charles County?

67% of private schools in St. Charles County are religiously affiliated (most commonly Catholic and Lutheran Church Missouri Synod).

Which private schools in St. Charles County are often viewed compared to one another?

Popular comparisons of private schools in St. Charles County include: Mid Rivers SDA School vs. The Lead School, Duchesne High School vs. St. Dominic High School, St. Theodore School vs. St. Patrick Catholic School

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