Best Mchenry County Private High Schools (2026)

For the 2026 school year, there are 5 private high schools serving 671 students in Mchenry County, IL.

The private high schools in Mchenry County, IL include Marian Central Catholic High School, Allendale-linc, and Trinity Oaks Christian Academy.

The average acceptance rate is 94%, which is higher than the Illinois private high school average acceptance rate of 81%.

80% of private high schools in Mchenry County, IL are religiously affiliated (most commonly Christian and Catholic).

Trinity Oaks Christian Academy Photo - Trinity Oaks Christian Academy moves to a new school home!

Top-Ranked Mchenry County Private High Schools (2026)

School

Location

Quick Facts

Allendale-linc

Special Education School

Add to Compare

1055 Lake Ave
Woodstock, IL 60098
(815) 206-5725

Gr: 6-12 | 34 students

Marian Central Catholic High School

(Catholic)

Add to Compare

1001 McHenry Ave
Woodstock, IL 60098
(815) 338-4220

Gr: 9-12 | 294 students Avg. class size: 17 students Sports: 17 Tuition & acceptance rate listed

Trinity Oaks Christian Academy

(Christian)

Add to Compare

(5)

233 Trinity Oaks Way
Cary, IL 60013
(847) 462-5971

Gr: PK-12 | 281 students Avg. class size: 20 students Sports: 5 | Extracurrculars: 7 Tuition & acceptance rate listed

Notre Dame Academy

(Catholic)

Add to Compare

10002 Harmony Hill Rd
Marengo, IL 60152
(815) 923-4350

Gr: K-12 | 20 students

Woodstock Christian School

(Christian)

Add to Compare

1201 Dean St
Woodstock, IL 60098
(815) 338-1391

Gr: K-9 | 42 students Sports: 2

[+] Show Closed Private Schools in Mchenry County, Illinois

Mchenry County Private Schools (Closed)

School

Location

Quick Facts

Faith Lutheran High School (Closed 2018)

(Lutheran Church Missouri Synod)

174 McHenry Ave.
Crystal Lake, IL 60014
(815) 479-9305

Gr: 9-12 | 81 students Avg. class size: 12 students Tuition & acceptance rate listed

Fox Valley Christian School (Closed 2010)

Alternative School (Baptist)

509 Front St
Mchenry, IL 60050
(815) 385-0126

Gr: 5-12 | 10 students Avg. class size: 6 students Tuition listed

Overview

This County (Mchenry County)

This State (IL)

# Schools

5 Schools

View Data

Trends in Total Number of Private High Schools
Year	Mchenry County Total Schools
2025	5
2024	5
2023	5
2022	4
2021	5
2020	5
2019	5
2018	5
2017	5
2016	6
2015	7

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Student Body:

# Students

671 Students

89,884 Students

View Data

Trends in the Average Number of Students Per Private High School
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	134	238	253
2024	131	230	245
2023	124	248	247
2022	239	255	257
2021	207	247	249
2020	207	233	235
2019	214	252	242
2018	209	243	238
2017	209	239	246
2016	184	238	241
2015	157	230	220

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% Average Students of Color

20%

35%

View Data

Percentage of Students of Color Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	20%	35%	32%
2024	16%	35%	31%
2023	19%	34%	31%
2022	12%	34%	30%
2021	12%	34%	30%
2020	12%	34%	29%
2019	7%	32%	29%
2018	7%	33%	28%
2017	9%	34%	30%
2016	9%	35%	30%
2015	9%	34%	30%

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Academics and Faculty:

# Teachers

65 Teachers

7,537 Teachers

Average Student-Teacher Ratio

10:1

11:1

View Data

Student-Teacher Ratio Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	10:1	11:1	10:1
2024	10:1	11:1	10:1
2023	11:1	11:1	10:1
2022	15:1	11:1	10:1
2021	14:1	11:1	10:1
2020	14:1	11:1	10:1
2019	13:1	11:1	10:1
2018	13:1	12:1	10:1
2017	13:1	12:1	10:1
2016	13:1	12:1	10:1
2015	13:1	12:1	10:1

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% Average Faculty w/Advanced Degree

56%

View Data

Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	56%	56%	57%
2024	56%	55%	57%
2023	56%	54%	57%
2022	50%	55%	56%
2021	37%	55%	56%
2020	37%	54%	56%
2019	37%	54%	55%
2018	37%	53%	55%
2017	37%	54%	55%
2016	37%	54%	54%
2015	37%	55%	54%

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Average Class Size

19 students

15 students

View Data

Class Size Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	19	15	14
2024	18	15	14
2023	18	15	14
2022	18	15	14
2021	15	15	14
2020	15	15	14
2019	15	15	14
2018	15	16	14
2017	15	16	14
2016	15	16	14
2015	12	16	14

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Average Number of AP Courses

13 courses

11 courses

View Data

Trends in Average Number of AP Courses Offered
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	13	11	13
2024	11	9	12
2023	11	9	12
2022	4	9	12
2021	5	9	12
2020	5	9	12
2019	5	9	11
2018	6	9	11
2017	6	9	11
2016	6	9	11
2015	4	9	10

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Average ACT score

(Out of 36)

View Data

ACT Score Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	28	25	26
2024	28	25	26
2023	28	25	26
2022	28	25	26
2021	27	25	26
2020	27	25	26
2019	27	25	25
2018	25	25	25
2017	25	25	25
2016	25	24	25
2015	25	24	25

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$10,705

$15,730

View Data

Tuition Cost Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	$10,705	$15,731	$17,997
2024	$9,165	$14,197	$17,011
2023	$9,165	$13,364	$16,191
2022	$7,030	$12,798	$15,821
2021	$7,490	$12,234	$15,331
2020	$7,490	$12,456	$15,046
2019	$7,490	$11,771	$14,791
2018	$7,490	$11,798	$14,527
2017	$7,490	$11,717	$14,161
2016	$5,977	$10,185	$13,713
2015	$5,145	$9,775	$13,065

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Average Acceptance Rate

94%

81%

View Data

Acceptance Rate Trends (2015-2025)
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	94%	82%	79%
2024	90%	85%	81%
2023	90%	86%	81%
2022	90%	87%	81%
2021	78%	87%	81%
2020	78%	87%	81%
2019	78%	86%	81%
2018	78%	86%	80%
2017	78%	86%	81%
2016	78%	89%	80%
2015	78%	88%	81%

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Students by Ethnicity:

0.39

0.62

View Data

Diversity Score Trends
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	0.39	0.62	0.61
2024	0.37	0.62	0.60
2023	0.39	0.62	0.60
2022	0.35	0.60	0.58
2021	0.35	0.60	0.57
2020	0.35	0.61	0.57
2019	0.25	0.60	0.56
2018	0.21	0.58	0.55
2017	0.16	0.56	0.54
2016	0.19	0.56	0.54
2015	0.19	0.57	0.53

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# American Indian Students

1 Student

298 Students

% American Indian Students

n/a

# Asian Students

39 Students

5,624 Students

% Asian Students

View Data

Asian Student Percentage Trends
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	5%	7%	5%
2024	5%	7%	6%
2023	6%	8%	6%
2022	5%	8%	5%
2021	5%	7%	5%
2020	5%	7%	5%
2019	1%	6%	5%
2018	1%	7%	5%
2017	2%	4%	4%
2016	2%	4%	4%
2015	2%	5%	4%

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# Hispanic Students

63 Students

10,091 Students

% Hispanic Students

11%

View Data

Hispanic Student Percentage Trends
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	7%	11%	9%
2024	7%	11%	9%
2023	7%	11%	8%
2022	4%	10%	8%
2021	4%	10%	8%
2020	4%	10%	8%
2019	2%	9%	8%
2018	2%	10%	8%
2017	4%	10%	7%
2016	3%	9%	8%
2015	3%	9%	8%

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# Black Students

18 Students

9,671 Students

% Black Students

11%

View Data

Black Student Percentage Trends
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	2%	11%	8%
2024	2%	11%	8%
2023	3%	10%	8%
2022	2%	10%	8%
2021	2%	11%	8%
2020	2%	11%	8%
2019	2%	11%	8%
2018	2%	11%	8%
2017	2%	11%	8%
2016	2%	12%	8%
2015	2%	12%	9%

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# White Students

679 Students

52,469 Students

% White Students

77%

58%

View Data

White Student Percentage Trends
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	77%	58%	59%
2024	79%	58%	60%
2023	78%	58%	60%
2022	80%	60%	62%
2021	80%	60%	63%
2020	80%	60%	64%
2019	87%	61%	64%
2018	89%	62%	65%
2017	92%	64%	66%
2016	90%	64%	66%
2015	90%	63%	66%

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# Hawaiian Students

n/a

105 Students

% Hawaiian Students

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

79 Students

12,125 Students

% of Others Students

14%

View Data

Other Races Student Percentage Trends
Year	Mchenry County Average	Illinois (IL) Average	National Average
2025	9%	13%	17%
2024	7%	13%	15%
2023	6%	13%	16%
2022	9%	12%	16%
2021	9%	12%	15%
2020	9%	12%	14%
2019	7%	13%	14%
2018	5%	10%	13%
2016	3%	11%	13%
2015	3%	11%	12%

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All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

7 extracurriculars

14 extracurriculars

Average Number of Sports

8 sports

9 sports

Frequently Asked Questions

What are the top-ranked private high schools in Mchenry County, IL?

The private high schools in Mchenry County, IL include Marian Central Catholic High School, Allendale-linc, and Trinity Oaks Christian Academy.

How many private high schools are located in Mchenry County?

5 private high schools are located in Mchenry County.

How diverse are private high schools in Mchenry County?

Mchenry County private high schools are approximately 20% minority students, which is lower than the Illinois private school average of 35%.

What percentage of private high schools are religiously affiliated in Mchenry County?

80% of private high schools in Mchenry County are religiously affiliated (most commonly Christian and Catholic).

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