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High Schools in Mercer Island School District

Coming soon: We're expecting this year's test scores from the Washington Office of Superindentent of Public Instruction any day now — new rankings will be posted the moment they're released!

Coming soon: This year's test scores are expected from the Washington Office of Superindentent of Public Instruction any day now — new rankings will follow the moment they're released!

At a glance

DistrictMercer Island School District1^st of 247 Washington districtsFull district overview →

School

1,439

Students

5-star school

Top rankedMercer Island High School4^th of 438 Washington high schools

Compare Washington districts →See the top-ranked Washington schools →

Summary:

Mercer Island School District is home to one high school, Mercer Island High School, serving about 1,440 students in grades 9-12 in an affluent community.

Mercer Island High School is a standout institution, consistently ranked among the very best in Washington, placing 4th out of 438 high schools for the 2024-2025 school year. It demonstrates exceptional academic results, with over 95% of students proficient in English, over 92% in science, and over 81% in math, significantly outperforming state averages. The school also boasts a 96.1% graduation rate and a very low dropout rate of 1.3%, indicating strong student support and success.

This excellence is supported by the top-ranked Mercer Island School District and substantial per-student funding. The school's performance has remained elite and stable over several years. While the single-school district prevents direct local comparisons, the data clearly shows Mercer Island High School provides a consistently high-quality education within a high-performing district system.

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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 (2025)				Ranking (2024)				WCAS Science (2025)		SBAC English Language Arts (2025)		SBAC Math (2025)		Per Pupil Expenditures (2024)
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/Discounted Lunch Recipients	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	SchoolDigger Rating (2025)	Average Standard Score (2024)	Statewide Rank (2024)	State Percentile (2024)	Rank Change from Previous Year	WCAS Science 11th Grade	WCAS Science All Grades	SBAC English Language Arts 10th Grade	SBAC English Language Arts All Grades	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%)	98.8	4^th of 438 public high schools	99.1%		98.4	3^rd of 437 public high schools	99.3%	1	92.7	92.7	95.1	95.1	81.4	81.4	$19,890	$301	$19,589

Districts nearby

District	Distance	# of Schools	Statewide Rank
Bellevue School District	1.93 mi	30	17^th
Renton School District	1.99 mi	29	133^rd
Seattle School District No. 1	2.21 mi	108	45^th
Rainier Valley Leadership Academy	2.54 mi	1
Impact \| Salish Sea Elementary	3.03 mi	1	150^th

See the top WA Washington districts

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.