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Rainier Prep

Public, Charter Grades 5-8

48^th

SchoolDigger Rank ?

of 514 Washington Middle Schools

Better than 91% of Washington middle schools

Summary

Rainier Prep is a small public charter middle school in Seattle’s south end, serving 359 students in grades 5–8 through the Rainier Prep Charter School District. The school has a 74.09% free- or reduced-price lunch rate, a 14.6 student-teacher ratio, and a 2025–26 statewide rank of 48th out of 514 schools, placing it in the 91st percentile. It received a five-star rating, and its small size and relatively low student-teacher ratio distinguish it from most nearby middle schools.

Rainier Prep’s academic results are well above Washington averages in every tested subject: 71.03% of students were proficient in English language arts, 67.69% in math, and 66.85% in science. Math was nearly 25 percentage points above the state rate. The school has also made broad gains since 2022–23, including a 17.23-point increase in math and a 27.10-point increase in science. Its statewide rank rose from 126th in 2024–25 to 48th in 2025–26. Rainier Prep’s results are below those of Islander Middle School and Madison Middle School, but it is stronger in all three subjects than Mercer International Middle School and substantially ahead of several other nearby schools.

The school’s strongest grade-level result is seventh-grade ELA, at 80.68%, while eighth grade is comparatively weaker, especially in science at 54.95%. This makes eighth-grade performance and science consistency useful areas to monitor. Rainier Prep also ranks exceptionally well statewide for several student groups, including students from low socioeconomic backgrounds and English learners, though these rankings describe subgroup performance rather than enrollment or proficiency percentages. Its $21,731 per-student spending is relatively high but not the highest among comparisons. Overall, Rainier Prep combines strong achievement, rapid recent improvement, small scale, and a high-need enrollment profile, making it one of the more notable schools in the Seattle-area comparison group.

359

Students ?

14.6

Student/teacher ratio ?

$21,731

Per pupil spending ?

74.1%

Free/reduced lunch eligible (2024-25) ?

10211 12th Ave S
Seattle, WA 98168

(206) 494-5979

District: Rainier Prep Charter School District

Racial breakdown:

African American:

50.7%

Hispanic:

30.1%

Asian:

8.4%

See top rated Washington middle schools

Compare Rainier Prep to nearby middle schools!

At a glance

▲ Ranking trend: Improving — 76th percentile in 2018 → 91st in 2026

Strengths

✓Test scores above the Washington average (69% vs 48% meeting standards)

✓Ranks in the top 9% of Washington middle schools

✓Ranking is trending up — up 15 percentile points since 2018

Worth a look

!Some student groups rank well below the school's overall statewide standing

Students meeting standards (2025-2026) ?

This school69%

District avg69%

Washington avg48%

48^th of 514

Washington public middle schools ?

Top 9%▲ up 14 pts since 2018

From top 24% (2018) to top 9% (2026)

See the entire ranking list of Washington Middle Schools →

★★★★★

SchoolDigger rating ?

5^th of 238Rainier Prep Charter 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	90.2	48 of 514	90.7%	★★★★★
2025	71.8	126 of 534	76.4%	★★★★☆
2024	73.6	120 of 535	77.6%	★★★★☆
2023	69.4	142 of 539	73.7%	★★★★☆
2022	54.3	207 of 541	61.7%	★★★☆☆
2021	42.1	294 of 529	44.4%	★★☆☆☆
2019	72.6	120 of 512	76.6%	★★★★☆
2018	73.1	104 of 437	76.2%	★★★★☆

African American

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	98.6	2 of 100	98.0%	★★★★★
2025	86.8	8 of 101	92.1%	★★★★★
2024	86.1	7 of 90	92.2%	★★★★★
2023	94.0	2 of 96	97.9%	★★★★★
2022	80.7	13 of 104	87.5%	★★★★☆
2021	69.3	18 of 106	83.0%	★★★★☆
2019	86.6	8 of 111	92.8%	★★★★★
2018	95.9	2 of 66	97.0%	★★★★★

Asian

Year	Avg score	Statewide rank	Washington percentile	Rating
2019	65.1	50 of 152	67.1%	★★★☆☆

English Language Learner

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	87.0	12 of 143	91.6%	★★★★★
2025	67.9	22 of 96	77.1%	★★★★☆
2024	82.6	10 of 78	87.2%	★★★★☆
2023	62.0	13 of 57	77.2%	★★★★☆
2022	49.4	22 of 63	65.1%	★★★☆☆
2021	78.6	6 of 50	88.0%	★★★★☆
2019	93.2	6 of 100	94.0%	★★★★★
2018	84.1	6 of 135	95.6%	★★★★★

Female

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	90.7	39 of 443	91.2%	★★★★★
2025	69.7	129 of 471	72.6%	★★★★☆
2024	79.7	82 of 464	82.3%	★★★★☆
2023	72.3	113 of 464	75.6%	★★★★☆
2022	56.1	179 of 479	62.6%	★★★☆☆
2021	40.1	274 of 469	41.6%	★★☆☆☆
2019	74.0	102 of 452	77.4%	★★★★☆
2018	78.2	75 of 376	80.1%	★★★★☆

Hispanic

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	94.4	18 of 347	94.8%	★★★★★
2025	77.6	53 of 347	84.7%	★★★★☆
2024	92.1	17 of 344	95.1%	★★★★★
2023	90.1	23 of 336	93.2%	★★★★★
2022	66.6	86 of 360	76.1%	★★★★☆
2021	54.4	127 of 353	64.0%	★★★☆☆
2019	85.1	33 of 344	90.4%	★★★★★
2018	87.3	25 of 259	90.3%	★★★★★

Low Socio Economic Status

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	98.7	6 of 453	98.7%	★★★★★
2025	85.2	34 of 457	92.6%	★★★★★
2024	91.4	12 of 455	97.4%	★★★★★
2023	88.6	20 of 463	95.7%	★★★★★
2022	77.4	56 of 475	88.2%	★★★★☆
2021	71.3	67 of 458	85.4%	★★★★☆
2019	88.2	15 of 448	96.7%	★★★★★
2018	93.2	17 of 349	95.1%	★★★★★

Male

Year	Avg score	Statewide rank	Washington percentile	Rating
2026	85.2	66 of 454	85.5%	★★★★☆
2025	70.5	121 of 472	74.4%	★★★★☆
2024	60.1	166 of 466	64.4%	★★★☆☆
2023	63.5	148 of 470	68.5%	★★★☆☆
2022	51.7	196 of 480	59.2%	★★★☆☆
2021	45.0	243 of 476	48.9%	★★☆☆☆
2019	68.5	118 of 453	74.0%	★★★★☆
2018	62.8	122 of 371	67.1%	★★★☆☆

Special Education

Year	Avg score	Statewide rank	Washington percentile	Rating
2019	34.9	143 of 231	38.1%	★★☆☆☆

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)

Low Socio Economic Status (2026)99th percentile+8 vs school

African American (2026)98th percentile+7 vs school

Hispanic (2026)95th percentile+4 vs school

English Language Learner (2026)92nd percentile~ school

Female (2026)91st percentile~ school

Male (2026)85th percentile-5 vs school

Asian (2019)67th percentile-9 vs school

Special Education (2019)38th percentile-38 vs school

By subject vs Washington (2025-2026) ?

English Language Arts71%+18 vs state

Math68%+25 vs state

Science67%+16 vs state

5.0

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What people are saying

by a parent
Thursday, February 14, 2019

We love Rainier Prep! Our son started there in 5th grade and is in 8th grade now. He is challenged not only academically but taught as a whole person. His self esteem is increased and he strives to better himself. We will be sending our second son next year. The founder Maggie O'Sullivan is outstanding with passion for the kids. Every teacher our son has had is incredible. Close Quote

Schools Near Rainier Prep

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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 (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/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 5th Grade	WCAS Science 8th Grade	WCAS Science All Grades	SBAC English Language Arts 5th Grade	SBAC English Language Arts 6th Grade	SBAC English Language Arts 7th Grade	SBAC English Language Arts 8th Grade	SBAC English Language Arts All Grades	SBAC Math 5th Grade	SBAC Math 6th Grade	SBAC Math 7th Grade	SBAC Math 8th Grade	SBAC Math All Grades	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Rainier Prep	Public, Charter	5-8	10211 12th Ave S	Seattle	98168	King County	Rainier Prep Charter School District	Yes	No	No	Yes	(206) 494-5979	359	25	14.6	74.1%	19 (5.3%)	182 (50.7%)	108 (30.1%)	30 (8.4%)	0 (0.0%)	2 (0.6%)	18 (5.0%)	90.2	48^th of 514 public middle schools	90.7%		71.8	126^th of 534 public middle schools	76.4%	78	78.9	55.0	66.9	67.8	71.1	80.7	64.8	71.0	65.6	70.0	71.6	63.7	67.7	$21,731	$3,615	$18,116
Cascade Middle School	Public	6-8	11212 10th Ave Sw	Seattle	98146	King County	Highline School District	No	No	No	Yes	(206) 631-5500	671	40	16.8	73.3%	45 (6.7%)	76 (11.3%)	327 (48.7%)	156 (23.2%)	2 (0.3%)	7 (1.0%)	54 (8.0%)	13.8	459^th of 514 public middle schools	10.7%		12.4	481^st of 534 public middle schools	9.9%	22		23.7	23.7		32.1	34.8	26.2	30.9		18.2	22.4	12.2	17.5	$20,983	$1,532	$19,451
Glacier Middle School	Public	6-8	2450 South 142nd Street	SeaTac	98168	King County	Highline School District	No	No	No	Yes	(206) 631-5300	803	35	22.7	75.5%	50 (6.2%)	61 (7.6%)	477 (59.4%)	126 (15.7%)	8 (1.0%)	27 (3.4%)	49 (6.1%)	4.1	509^th of 514 public middle schools	1.0%		4.4	528^th of 534 public middle schools	1.1%	19		16.1	16.1		11.3	21.7	15.0	16.0		7.7	11.3	9.5	9.5	$20,164	$1,544	$18,620
David T. Denny International Middle School	Public	6-8	2601 SW Kenyon St	Seattle	98126	King County	Seattle School District No. 1	No	No	No	Yes	(206) 252-9000	722	45	16.1	58.3%	179 (24.8%)	148 (20.5%)	204 (28.3%)	88 (12.2%)	4 (0.6%)	12 (1.7%)	81 (11.2%)	54	214^th of 514 public middle schools	58.4%		40.6	303^rd of 534 public middle schools	43.3%	89		44.3	44.3		47.8	53.8	52.1	51.2		36.0	40.4	40.7	39.0	$23,858	$741	$23,117
Aki Kurose Middle School	Public	6-8	3928 S Graham St	Seattle	98118	King County	Seattle School District No. 1	No	No	No	Yes	(206) 252-7700	817	45	18.0	56.8%	154 (18.8%)	239 (29.3%)	146 (17.9%)	192 (23.5%)	3 (0.4%)	12 (1.5%)	60 (7.3%)	45.3	266^th of 514 public middle schools	48.2%		50.5	240^th of 534 public middle schools	55.1%	26		41.7	41.7		43.8	48.7	44.2	45.5		29.6	41.0	40.1	36.5	$22,443	$1,032	$21,411
Showalter Middle School	Public	6-8	4628 S 144th St	Seattle	98168	King County	Tukwila School District	No	No	No	Yes	(206) 901-7800	651	32	20.4	75.4%	50 (7.7%)	121 (18.6%)	243 (37.3%)	164 (25.2%)	5 (0.8%)	31 (4.8%)	36 (5.5%)	10.3	479^th of 514 public middle schools	6.8%		12.4	482^nd of 534 public middle schools	9.7%	3		27.8	27.8		24.3	23.4	27.7	25.0		14.8	14.6	17.5	15.6	$22,084	$2,819	$19,265
Mercer International Middle School	Public	6-8	1600 S Columbian Wy	Seattle	98108	King County	Seattle School District No. 1	No	No	No	No	(206) 252-8000	753	43	17.4	59.8%	91 (12.1%)	115 (15.3%)	157 (20.8%)	301 (40.0%)	4 (0.5%)	2 (0.3%)	80 (10.6%)	83.3	82^nd of 514 public middle schools	84.0%		69.5	139^th of 534 public middle schools	74.0%	57		58.4	58.4		65.1	66.6	63.2	65.0		64.2	54.2	50.8	56.6	$21,123	$761	$20,362
Sylvester Middle School	Public	6-8	16222 Sylvester Road SW	Burien	98166	King County	Highline School District	No	No	No	Yes	(206) 631-6000	582	30	19.3	49.5%	217 (37.3%)	49 (8.4%)	189 (32.5%)	48 (8.2%)	9 (1.5%)	11 (1.9%)	57 (9.8%)	42.3	282^nd of 514 public middle schools	45.1%		38	319^th of 534 public middle schools	40.3%	37		49.1	49.1		42.5	41.1	45.2	42.7		31.9	33.8	36.0	33.8	$21,126	$1,327	$19,799
Dimmitt Middle School	Public	6-8	12320 80th Ave S	Seattle	98178	King County	Renton School District	No	No	No	Yes	(425) 204-2800	605	34	17.5	62.3%	64 (10.6%)	141 (23.3%)	172 (28.4%)	157 (26.0%)	4 (0.7%)	21 (3.5%)	46 (7.6%)	30.7	352^nd of 514 public middle schools	31.5%		28	390^th of 534 public middle schools	27.0%	38		32.3	32.3		41.0	41.2	31.4	38.1		33.2	34.3	27.4	31.8	$21,054	$2,276	$18,778
Islander Middle School	Public	6-8	8225 SE 72nd	Mercer Island	98040	King County	Mercer Island School District	No	No	No	No	(206) 236-3413	960	45	21.3	7.8%	440 (45.8%)	9 (0.9%)	74 (7.7%)	306 (31.9%)	1 (0.1%)	0 (0.0%)	126 (13.1%)	98.3	9^th of 514 public middle schools	98.2%		97.2	13^th of 534 public middle schools	97.6%	4		75.5	75.5		83.6	87.2	82.3	84.2		75.7	83.0	78.0	78.8	$17,200	$267	$16,933

Frequently Asked Questions about Rainier Prep

What district is Rainier Prep in?

Rainier Prep Charter School District

Is Rainier Prep a good school?

Yes. Rainier Prep ranks in the top 9.3% of Washington middle schools.

What is the racial makeup of Rainier Prep?

Students at Rainier Prep are 51% African American, 30% Hispanic, 8% Asian, 5% White, 5% Two or more races.

How many students attend Rainier Prep?

In the 2024-25 school year, 359 students attended Rainier Prep.

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Latest Washington data All new data »

2025–26 SBAC & WCAS test scoresSep 10, 2026

2024–25 dropout rates & graduation ratesJan 8, 2026

2022–23 through 2023–24 school spending dataJan 6, 2026

2024–25 SBAC & WCAS test scoresSep 10, 2025

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.