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Mercer Island High School

Public Grades 9-12

2^nd

SchoolDigger Rank ?

of 396 Washington High Schools

Better than 99% of Washington high schools

Summary

Mercer Island High School is a large traditional public high school serving grades 9–12, with 1,439 students in the suburban Mercer Island area near Bellevue and Seattle. The school is part of the highly ranked Mercer Island School District, which ranks first among Washington’s 238 districts. In 2025–26, the school ranked second out of 396 Washington high schools, following rankings of fourth in 2024–25 and third in 2023–24. This is a sustained pattern of exceptional performance, not a single unusually strong year.

Academic results are excellent across all three tested subjects. In 2025–26, 92.71% of students were proficient in English Language Arts, 79.81% in math, and 88.59% in science—at least 36 percentage points above statewide results in each subject. Science is a particular strength compared with nearby schools: Mercer Island exceeded Newport Senior High School by 7.25 percentage points and Bellevue High School by 26.94 points. Newport had somewhat stronger math results, while International School also led Mercer Island in math. Mercer Island’s results declined modestly from the prior year, especially in science, but remain among Washington’s strongest.

Families may also value the school’s 96.1% graduation rate and 1.3% dropout rate in 2024–25, both substantially better than statewide figures. Its graduation rate narrowly exceeded Newport’s 95.5%. The school’s subgroup effectiveness rankings are also unusually strong, with five-star ratings for every listed group, including students receiving special education services, English learners, and students from low socioeconomic backgrounds. Context matters: only 7.09% of students qualified for free or reduced-price lunch, far below rates at Franklin High School, Sammamish Senior High, and Rainier Beach High School. Math is the main area to monitor, but overall Mercer Island stands out as one of Washington’s most consistently high-performing comprehensive high schools.

1,439

Students ?

18.8

Student/teacher ratio ?

$20,620

Per pupil spending ?

7.1%

Free/reduced lunch eligible (2024-25) ?

9100 SE 42nd
Mercer Island, WA 98040-4199

(206) 236-3345

District: Mercer Island School District

Feeder schools for Mercer Island High School:

Elementary:	Island Park Elementary
	Lakeridge Elementary School
	Northwood Elementary School
	West Mercer Elementary
Middle:	Islander Middle School

Racial breakdown:

White:

51.6%

Asian:

25.2%

Two or more races:

13.3%

See top rated Washington high schools

Compare Mercer Island High School to nearby high schools!

At a glance

▬ Ranking trend: Holding steady — 98th percentile in 2016 → 99th in 2026

Strengths

✓Test scores above the Washington average (87% vs 48% meeting standards)

✓Ranks in the top 1% of Washington high schools

✓96% graduate in 4 years — above the Washington average (83%)

Students meeting standards (2025-2026) ?

This school87%

District avg84%

Washington avg48%

2^nd of 396

Washington public high schools ?

Top 1%▲ up 2 pts since 2016

See the entire ranking list of Washington High Schools →

★★★★★

SchoolDigger rating ?

1^st of 238Mercer Island School District among Washington districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	99.0	2 of 396	99.5%	★★★★★
2025	98.8	4 of 438	99.1%	★★★★★
2024	98.4	3 of 437	99.3%	★★★★★
2023	98.2	5 of 442	98.9%	★★★★★
2022	96.9	6 of 434	98.6%	★★★★★
2021	97.7	6 of 455	98.7%	★★★★★
2019	97.5	6 of 417	98.6%	★★★★★
2018	87.6	20 of 315	93.7%	★★★★★
2017	79.5	48 of 301	84.1%	★★★★☆
2016	91.9	7 of 306	97.7%	★★★★★
2015	47.5	164 of 341	51.9%	★★★☆☆
2013	79.7	25 of 454	94.5%	★★★★★
2012	83.5	10 of 450	97.8%	★★★★★
2011	86.3	9 of 440	98.0%	★★★★★
2010	92.9	12 of 423	97.2%	★★★★★
2009	89.5	13 of 402	96.8%	★★★★★
2008	90.7	12 of 396	97.0%	★★★★★
2007	91.2	9 of 399	97.7%	★★★★★
2006	93.4	7 of 395	98.2%	★★★★★
2005	95.8	4 of 394	99.0%	★★★★★
2004	97.3	4 of 390	99.0%	★★★★★

Asian

Year	Avg score	Statewide rank	Washington percentile	Rating
2025	95.5	2 of 119	98.3%	★★★★★
2024	91.3	7 of 113	93.8%	★★★★★
2023	89.5	14 of 118	88.1%	★★★★☆
2022	90.2	11 of 124	91.1%	★★★★★
2021	90.1	8 of 136	94.1%	★★★★★
2019	95.4	2 of 121	98.3%	★★★★★
2018	78.0	16 of 87	81.6%	★★★★☆

English Language Learner

Year	Avg score	Statewide rank	Washington percentile	Rating
2025	99.9	1 of 85	98.8%	★★★★★

Female

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	99.7	1 of 309	99.7%	★★★★★
2025	98.1	2 of 350	99.4%	★★★★★
2024	98.1	4 of 347	98.8%	★★★★★
2023	97.5	5 of 357	98.6%	★★★★★
2022	95.4	10 of 368	97.3%	★★★★★
2021	97.9	5 of 390	98.7%	★★★★★
2019	96.9	5 of 358	98.6%	★★★★★
2018	85.9	20 of 243	91.8%	★★★★★

Hispanic

Year	Avg score	Statewide rank	Washington percentile	Rating
2025	99.7	2 of 249	99.2%	★★★★★
2024	100.0	1 of 248	99.6%	★★★★★
2023	99.8	1 of 249	99.6%	★★★★★
2022	94.5	11 of 261	95.8%	★★★★★
2021	99.8	1 of 278	99.6%	★★★★★

Low Socio Economic Status

Year	Avg score	Statewide rank	Washington percentile	Rating
2025	97.6	5 of 355	98.6%	★★★★★
2024	99.1	3 of 356	99.2%	★★★★★
2023	97.9	6 of 362	98.3%	★★★★★
2022	97.2	4 of 370	98.9%	★★★★★
2021	93.8	9 of 392	97.7%	★★★★★

Male

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	99.1	1 of 326	99.7%	★★★★★
2025	99.1	2 of 359	99.4%	★★★★★
2024	98.6	3 of 362	99.2%	★★★★★
2023	98.7	3 of 358	99.2%	★★★★★
2022	97.8	3 of 363	99.2%	★★★★★
2021	97.3	5 of 395	98.7%	★★★★★
2019	97.8	4 of 355	98.9%	★★★★★
2018	87.5	13 of 254	94.9%	★★★★★

Multi-racial

Year	Avg score	Statewide rank	Washington percentile	Rating
2025	97.2	1 of 170	99.4%	★★★★★
2024	96.0	2 of 161	98.8%	★★★★★
2023	98.1	1 of 166	99.4%	★★★★★
2022	95.4	3 of 179	98.3%	★★★★★
2021	97.7	1 of 195	99.5%	★★★★★
2019	92.5	8 of 163	95.1%	★★★★★
2018	82.1	13 of 91	85.7%	★★★★☆

Special Education

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	96.1	4 of 144	97.2%	★★★★★
2025	88.7	13 of 127	89.8%	★★★★★
2024	97.7	3 of 110	97.3%	★★★★★
2023	93.1	10 of 110	90.9%	★★★★★
2022	99.6	1 of 130	99.2%	★★★★★
2021	81.1	14 of 212	93.4%	★★★★★
2019	100.0	1 of 128	99.2%	★★★★★
2018	99.7	1 of 139	99.3%	★★★★★

White

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	97.8	4 of 319	98.7%	★★★★★
2025	98.1	2 of 373	99.5%	★★★★★
2024	97.8	2 of 374	99.5%	★★★★★
2023	97.0	3 of 379	99.2%	★★★★★
2022	94.7	7 of 390	98.2%	★★★★★
2021	95.6	8 of 413	98.1%	★★★★★
2019	95.2	6 of 382	98.4%	★★★★★
2018	81.9	30 of 222	86.5%	★★★★☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

Male (2026)100th percentile~ school

Female (2026)100th percentile~ school

Multi-racial (2025)99th percentile~ school

Hispanic (2025)99th percentile~ school

English Language Learner (2025)99th percentile~ school

White (2026)99th percentile~ school

Low Socio Economic Status (2025)99th percentile~ school

Asian (2025)98th percentile~ school

Special Education (2026)97th percentile~ school

By subject vs Washington (2025-2026) ?

English Language Arts93%+40 vs state

Science89%+38 vs state

Math80%+37 vs state

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Schools Near Mercer Island High School

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Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				WCAS Science (2026)			SBAC English Language Arts (2026)					SBAC Math (2026)					Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	WCAS Science 8th Grade	WCAS Science 11th Grade	WCAS Science All Grades	SBAC English Language Arts 6th Grade	SBAC English Language Arts 7th Grade	SBAC English Language Arts 8th Grade	SBAC English Language Arts 10th Grade	SBAC English Language Arts All Grades	SBAC Math 6th Grade	SBAC Math 7th Grade	SBAC Math 8th Grade	SBAC Math 10th Grade	SBAC Math All Grades	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Mercer Island High School	Public	9-12	9100 SE 42nd	Mercer Island	98040	King County	Mercer Island School District	No	No	No	No	(206) 236-3345	1,439	76	18.8	7.1%	743 (51.6%)	20 (1.4%)	102 (7.1%)	362 (25.2%)	1 (0.1%)	5 (0.3%)	192 (13.3%)	99	2^nd of 396 public high schools	99.5%		98.8	4^th of 438 public high schools	99.1%	2		88.6	88.6				92.7	92.7				79.8	79.8	$20,620	$346	$20,275
Newport Senior High School	Public	9-12	4333 Factoria Boulevard SE	Bellevue	98006	King County	Bellevue School District	No	No	No	No	(425) 456-7400	1,850	90	20.5	15.9%	353 (19.1%)	48 (2.6%)	114 (6.2%)	1,126 (60.9%)	1 (0.1%)	3 (0.2%)	192 (10.4%)	98.6	5^th of 396 public high schools	98.7%		97.7	7^th of 438 public high schools	98.4%	2		81.3	81.3				91.0	91.0				82.9	82.9	$19,984	$306	$19,678
Bellevue High School	Public	9-12	10416 Wolverine Way	Bellevue	98004	King County	Bellevue School District	No	No	No	No	(425) 456-7000	1,683	78	21.5	18.6%	538 (32.0%)	66 (3.9%)	159 (9.4%)	690 (41.0%)	2 (0.1%)	10 (0.6%)	211 (12.5%)	93	27^th of 396 public high schools	93.2%		93.9	26^th of 438 public high schools	94.1%	1		61.7	61.7				86.1	86.1				70.8	70.8	$19,420	$133	$19,287
International School	Public	6-12	445 128th Ave SE	Bellevue	98005	King County	Bellevue School District	No	No	No	No	(425) 456-6500	600	30	19.9	8.0%	136 (22.7%)	10 (1.7%)	33 (5.5%)	361 (60.2%)	0 (0.0%)	1 (0.2%)	56 (9.3%)								(n/a)	88.0		89.9	85.9		82.6		88.3	78.3		72.8		83.1	$21,291	$133	$21,158
Bellevue Open Doors Reengagement	Public	10-12	12111 NE 1st Street	Bellevue	98005	King County	Bellevue School District	No	No	No	No	(425) 456-4175	24	0		12.5%	7 (29.2%)	1 (4.2%)	11 (45.8%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	5 (20.8%)								(n/a)														$6,907	$133	$6,774
Interagency Open Doors	Public	9-12	3528 S. Ferdinand Street	Seattle	98118	King County	Seattle School District No. 1	No	No	No	No	(206) 252-0010	132	0		50.8%	46 (34.8%)	13 (9.8%)	32 (24.2%)	13 (9.8%)	1 (0.8%)	1 (0.8%)	13 (9.8%)								(n/a)														$15,540	$360	$15,180
Franklin High School	Public	9-12	3013 S Mt Baker Bv	Seattle	98144	King County	Seattle School District No. 1	No	No	No	No	(206) 252-6150	1,277	65	19.6	57.2%	205 (16.1%)	336 (26.3%)	308 (24.1%)	310 (24.3%)	3 (0.2%)	9 (0.7%)	97 (7.6%)	56.9	158^th of 396 public high schools	60.1%		43.7	244^th of 438 public high schools	44.3%	86		43.5	43.5				71.4	71.4				29.6	29.6	$23,504	$381	$23,123
Bellevue Big Picture School	Public	6-12	14844 SE 22nd Street	Bellevue	98007	King County	Bellevue School District	No	No	No	No	(425) 456-7800	346	25	14.0	24.9%	139 (40.2%)	23 (6.6%)	44 (12.7%)	96 (27.7%)	0 (0.0%)	0 (0.0%)	34 (9.8%)	76	79^th of 396 public high schools	80.1%		74.2	88^th of 438 public high schools	79.9%	9	58.1	55.6	57.3	43.3	58.3	58.1		58.6	46.7	41.7	50.0	44.4	45.9	$24,169	$654	$23,515
Rainier Beach High School	Public	9-12	8815 Seward Park Av S	Seattle	98118	King County	Seattle School District No. 1	No	No	No	Yes	(206) 252-6350	854	43	19.8	66.9%	36 (4.2%)	352 (41.2%)	167 (19.6%)	198 (23.2%)	1 (0.1%)	28 (3.3%)	70 (8.2%)	36.9	261^st of 396 public high schools	34.1%		21.5	347^th of 438 public high schools	20.8%	86		32.1	32.1				49.2	49.2				34.4	34.4	$27,571	$1,568	$26,003
Middle College High School	Public	9-12	401 NE Northgate Way	Seattle	98125	King County	Seattle School District No. 1	No	No	No	No	(206) 366-7940	93	8	11.0	47.3%	36 (38.7%)	23 (24.7%)	10 (10.8%)	9 (9.7%)	1 (1.1%)	0 (0.0%)	8 (8.6%)								(n/a)												33.3	33.3	$26,117	$360	$25,757

Frequently Asked Questions about Mercer Island High School

What district is Mercer Island High School in?

Mercer Island School District

Is Mercer Island High School a good school?

Yes! Mercer Island High School is one of the best high schools in the state. It ranks 2^nd of 396 Washington high schools.

What is the racial makeup of Mercer Island High School?

Students at Mercer Island High School are 52% White, 25% Asian, 13% Two or more races, 7% Hispanic, 1% African American.

How many students attend Mercer Island High School?

In the 2024-25 school year, 1,439 students attended Mercer Island High School.

What schools feed into Mercer Island High School?

Mercer Island High School is fed by the following schools:

Elementary : Island Park Elementary
Elementary : Lakeridge Elementary School
Elementary : Northwood Elementary School
Elementary : West Mercer Elementary
Middle : Islander Middle School

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Latest Washington data All new data »

2024–25 school spending dataNewNov 2, 2026

2016–17 through 2025–26 immunization rates (updated)Oct 19, 2026

2025–26 SBAC & WCAS test scoresSep 10, 2026

2024–25 dropout rates & graduation ratesJan 8, 2026

SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau, the Washington State Department of Health and the Washington Office of Superindentent of Public Instruction.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.