Best Mercer Island Private High Schools (2026)

For the 2026 school year, there are 4 private high schools serving 468 students in Mercer Island, WA.

The private high schools in Mercer Island, WA include Northwest Yeshiva High School and St. Monica Catholic School.

The average acceptance rate is 94%, which is higher than the Washington private high school average acceptance rate of 83%.

50% of private high schools in Mercer Island, WA are religiously affiliated (most commonly Catholic and Jewish).

St. Monica Catholic School Photo - Unlocking Minds, Inspiring Hearts: Our classical liberal arts education integrates history, literature, philosophy, and theology to cultivate a love for learning.

Yellow Wood Academy Photo - We are so proud of our YWA graduates!

Top-Ranked Mercer Island Private High Schools (2026)

School

Location

Quick Facts

Northwest Yeshiva High School

(Jewish)

Add to Compare

(8)

5017 90th Avenue SE
Mercer Island, WA 98040
(206) 232-5272

Gr: 9-12 | 65 students Avg. class size: 12 students Sports: 5 | Extracurrculars: 11 Tuition listed

St. Monica Catholic School

(Catholic)

Add to Compare

(6)

4320 87th Avenue SE
Mercer Island, WA 98040
(206) 232-5432

Gr: NS-12 | 262 students Avg. class size: 21 students Extracurrculars: 17 Tuition & acceptance rate listed

Privett Academy

Add to Compare

9311 SE 36th St
Mercer Island, WA 98040
(206) 232-0059

Gr: 9-12 | 7 students Tuition listed

Yellow Wood Academy

Special Education School

Add to Compare

9655 SE 36th Street,
Mercer Island, WA 98040
(206) 236-1095

Gr: K-12 | 134 students Avg. class size: 1 student Tuition & acceptance rate listed

[+] Show Closed Private Schools in Mercer Island, Washington

Mercer Island, Washington Private Schools (Closed)

School

Location

Quick Facts

American Academy (Closed 2015)

(Christian)

7834 Se 32nd St
Mercer Island, WA 98040
(206) 230-5672

Gr: 1-12 | 25 students

Overview

This Town (Mercer Island)

This State (WA)

# Schools

4 Schools

View Data

Trends in Total Number of Private High Schools
Year	Mercer Island, WA Total Schools
2025	4
2024	4
2023	4
2022	4
2021	4
2020	4
2019	4
2018	4
2017	4
2016	4
2015	5

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Student Body:

# Students

468 Students

55,226 Students

View Data

Trends in the Average Number of Students Per Private High School
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	117	267	253
2024	117	261	245
2023	142	246	247
2022	144	234	257
2021	85	236	249
2020	85	225	235
2019	75	230	242
2018	63	234	238
2017	114	226	246
2016	113	224	241
2015	102	217	220

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% Average Students of Color

13%

29%

View Data

Percentage of Students of Color Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	13%	29%	32%
2024	13%	25%	31%
2023	8%	29%	31%
2022	12%	24%	30%
2021	19%	22%	30%
2020	20%	22%	29%
2019	19%	24%	29%
2018	20%	23%	28%
2017	15%	28%	30%
2016	18%	27%	30%
2015	15%	25%	30%

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Academics and Faculty:

# Teachers

101 Teachers

4,845 Teachers

Average Student-Teacher Ratio

5:1

11:1

View Data

Student-Teacher Ratio Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	5:1	11:1	10:1
2024	5:1	11:1	10:1
2023	6:1	11:1	10:1
2022	6:1	10:1	10:1
2021	4:1	11:1	10:1
2020	4:1	11:1	10:1
2019	3:1	11:1	10:1
2018	4:1	11:1	10:1
2017	6:1	11:1	10:1
2016	6:1	11:1	10:1
2015	5:1	11:1	10:1

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% Average Faculty w/Advanced Degree

70%

63%

View Data

Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	70%	63%	57%
2024	70%	61%	57%
2023	70%	63%	57%
2022	70%	63%	56%
2021	70%	62%	56%
2020	70%	63%	56%
2019	70%	62%	55%
2018	70%	59%	55%
2017	70%	59%	55%
2016	70%	56%	54%
2015	70%	57%	54%

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Average Class Size

11 students

14 students

View Data

Class Size Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	11	14	14
2024	11	14	14
2023	11	14	14
2022	12	14	14
2021	6	13	14
2020	6	13	14
2019	5	13	14
2018	5	13	14
2017	5	13	14
2016	5	13	14
2015	5	13	14

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Average Number of AP Courses

7 courses

10 courses

View Data

Trends in Average Number of AP Courses Offered
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	7	10	13
2024	7	8	12
2023	7	9	12
2022	8	8	12
2021	8	8	12
2020	10	8	12
2019	10	8	11
2018	3	8	11
2017	3	8	11
2016	6	7	11
2015	6	7	10

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Average SAT score

1380

(Out of 1600)

1259

View Data

SAT Score Trends (2017-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	1,380	1,263	1,233
2024	1,380	1,256	1,231
2023	1,380	1,232	1,229
2022	1,380	1,239	1,230
2021	1,380	1,246	1,230
2020	1,380	1,238	1,227
2019	1,380	1,247	1,226
2018	1,380	1,241	1,226
2017	1,380	1,255	1,233

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Average ACT score

(Out of 36)

View Data

ACT Score Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	29	28	26
2024	29	27	26
2023	29	27	26
2022	29	27	26
2021	29	27	26
2020	29	27	26
2019	29	27	25
2018	29	27	25
2017	29	27	25
2016	29	27	25
2015	28	27	25

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$23,688

$17,484

View Data

Tuition Cost Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	$23,688	$17,353	$17,997
2024	$31,676	$16,346	$17,011
2023	$30,226	$15,194	$16,191
2022	$26,978	$14,486	$15,821
2021	$19,000	$13,981	$15,331
2020	$19,000	$13,084	$15,046
2019	$19,000	$12,803	$14,791
2018	$19,000	$12,719	$14,527
2017	$19,000	$11,627	$14,161
2016	$19,000	$10,394	$13,713
2015	$16,000	$10,386	$13,065

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Average % on Financial Aid

60%

34%

View Data

Percent on Financial Aid Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	60%	34%	38%
2024	60%	31%	37%
2023	50%	31%	36%
2022	50%	30%	36%
2021	50%	30%	36%
2020	50%	32%	35%
2019	50%	32%	34%
2018	50%	33%	33%
2017	50%	31%	32%
2016	50%	29%	31%
2015	50%	28%	30%

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Average Financial Aid Grant

$15,900

$9,062

View Data

Financial Aid Grant Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	$15,900	$9,062	$9,714
2024	$15,900	$8,659	$9,498
2023	$14,756	$7,491	$8,890
2022	$14,756	$6,418	$8,717
2021	$13,500	$6,469	$8,472
2020	$13,500	$6,558	$8,370
2019	$13,500	$7,575	$7,924
2018	$13,500	$7,702	$7,471
2017	$13,500	$6,794	$7,202
2016	$13,500	$6,791	$6,993
2015	$8,568	$5,833	$6,822

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Average Acceptance Rate

94%

83%

View Data

Acceptance Rate Trends (2015-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	94%	83%	79%
2024	90%	86%	81%
2023	90%	83%	81%
2022	90%	84%	81%
2021	90%	84%	81%
2020	90%	83%	81%
2019	90%	81%	81%
2018	100%	80%	80%
2017	100%	80%	81%
2016	100%	78%	80%
2015	100%	81%	81%

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Average Endowment Size

$2 million

$49.63 million

View Data

Endowment Trends (2022-2025)
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	$2 M	$49 M	$65 M
2024	$2 M	$12 M	$65 M
2023	$2 M	$8 M	$65 M
2022	$2 M	$7 M	$67 M

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Students by Ethnicity:

0.45

0.61

View Data

Diversity Score Trends
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	0.45	0.61	0.61
2024	0.45	0.61	0.60
2023	0.43	0.60	0.60
2022	0.46	0.55	0.58
2021	0.57	0.56	0.57
2020	0.57	0.55	0.57
2019	0.47	0.55	0.56
2018	0.31	0.55	0.55
2017	0.55	0.54	0.54
2016	0.55	0.53	0.54
2015	0.54	0.53	0.53

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# American Indian Students

2 Students

626 Students

% American Indian Students

n/a

# Asian Students

11 Students

4,156 Students

% Asian Students

View Data

Asian Student Percentage Trends
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	3%	8%	5%
2024	3%	8%	6%
2023	4%	9%	6%
2022	8%	8%	5%
2021	10%	8%	5%
2020	10%	8%	5%
2019	12%	7%	5%
2018	14%	7%	5%
2017	8%	7%	4%
2016	8%	7%	4%
2015	8%	7%	4%

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# Hispanic Students

n/a

2,313 Students

% Hispanic Students

n/a

View Data

Hispanic Student Percentage Trends
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2021	1%	4%	8%
2020	1%	4%	8%
2019	1%	4%	8%
2018	1%	4%	8%
2017	1%	4%	7%
2016	1%	4%	8%
2015	1%	4%	8%

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# Black Students

4 Students

1,555 Students

% Black Students

View Data

Black Student Percentage Trends
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	1%	3%	8%
2024	1%	3%	8%
2023	1%	3%	8%
2022	1%	3%	8%
2021	2%	3%	8%
2020	2%	3%	8%
2019	3%	3%	8%
2018	3%	3%	8%
2017	2%	3%	8%
2016	2%	3%	8%
2015	2%	3%	9%

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# White Students

354 Students

30,346 Students

% White Students

69%

56%

View Data

White Student Percentage Trends
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	69%	56%	59%
2024	69%	56%	60%
2023	73%	58%	60%
2022	71%	63%	62%
2021	59%	62%	63%
2020	59%	64%	64%
2019	70%	64%	64%
2018	82%	64%	65%
2017	60%	64%	66%
2016	60%	65%	66%
2015	61%	66%	66%

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# Hawaiian Students

n/a

239 Students

% Hawaiian Students

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

140 Students

15,043 Students

% of Others Students

28%

View Data

Other Races Student Percentage Trends
Year	Mercer Island, WA Average	Washington (WA) Average	National Average
2025	27%	28%	17%
2024	27%	27%	15%
2023	22%	25%	16%
2022	20%	21%	16%
2021	28%	22%	15%
2020	28%	20%	14%
2019	14%	21%	14%
2017	29%	20%	14%
2016	29%	19%	13%
2015	27%	18%	12%

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All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

14 extracurriculars

11 extracurriculars

Average Number of Sports

5 sports

7 sports

Frequently Asked Questions

What are the top-ranked private high schools in Mercer Island, WA?

The private high schools in Mercer Island, WA include Northwest Yeshiva High School and St. Monica Catholic School.

How many private high schools are located in Mercer Island?

4 private high schools are located in Mercer Island.

What percentage of private high schools are religiously affiliated in Mercer Island?

50% of private high schools in Mercer Island are religiously affiliated (most commonly Catholic and Jewish).

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Best Mercer Island Private High Schools (2026)

Top-Ranked Mercer Island Private High Schools (2026)

Mercer Island, Washington Private Schools (Closed)

Overview

Trends in Total Number of Private High Schools

Student Body:

Trends in the Average Number of Students Per Private High School

Percentage of Students of Color Trends (2015-2025)

Academics and Faculty:

Student-Teacher Ratio Trends (2015-2025)

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

Class Size Trends (2015-2025)

Trends in Average Number of AP Courses Offered

SAT Score Trends (2017-2025)

ACT Score Trends (2015-2025)

Tuition and Acceptance Rate:

Tuition Cost Trends (2015-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Endowment Trends (2022-2025)

Students by Ethnicity:

Diversity Score Trends

Asian Student Percentage Trends

Hispanic Student Percentage Trends

Black Student Percentage Trends

White Student Percentage Trends

Other Races Student Percentage Trends

Extracurriculars and Sports:

Frequently Asked Questions