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Seattle Preparatory School

Private school · Seattle, King County · grades 9-12 · Catholic (Jesuit)

Snapshot

K-12 enrollment
800
SBE-reported, 2024-25
Tuition (top division)
$30,175
2026-27, school-published

Identity and approval

Campus
Seattle Preparatory School, 2400 11th Ave E, Seattle 98102
Host public district
Seattle School District
Grades
9-12
Religious affiliation
Catholic (Jesuit)
Coed / single-sex
coed
Website
https://www.seaprep.org
WA SBE approval
2026-27 (state-approved private school)
Profit status
Nonprofit

Enrollment

9101112
208191203198

Enrollment by grade, 2024-25 school year, as reported to the WA State Board of Education.

Tuition and financial aid

Annual tuition
$30,175 (2026-27)
By division / fees
Registration fee $650; activity fee $675; required laptop ~$2,100 (freshman year).
Financial aid
Need-based tuition assistance grants (no merit scholarships); Fulcrum Foundation grants available.

Source: the school's own tuition page · aid page, observed 2026-07-03. Tuition changes annually, verify before applying.

Academics

Curriculum
AP + College in the High School credit; integrated humanities (Collegio) grades 9-11.
College matriculation
Publishes annual college acceptance articles.
Washington private schools are not required to publish state assessment results, and this school's internal test data is not public. Unlike the public-school pages on this site, no score comparison is possible here, treat curriculum labels and matriculation lists as the available evidence.

Competition evidence

Known results compiled from public competition listings (National Merit press lists, tournament PDFs, The Blue Alliance). A missing result is not evidence of absence.

Research dossier

Seattle Preparatory School

Catholic (Jesuit) · coeducational · grades 9–12 · 800 students · Capitol Hill, Seattle

The verdict

Seattle Prep needs little introduction: 135 years on Capitol Hill, the Jesuit name, the mock trial trophies. The useful question is what its $30,175 base tuition (2026–27) actually buys. Against Lakeside's $52,000 for the same 2026–27 year, Prep runs about 58 cents on the dollar while reporting a 100% four-year-college acceptance rate. Against diocesan Bishop Blanchet or Kennedy Catholic it is the premium choice, and every family pays one rate, with no parishioner discount.

What the lower price does not buy is flexibility. For their first three years, all students sit in Collegio, an integrated English-history-theology block, with Advanced Placement (AP) humanities unavailable until senior year. Four years of theology, all-school Mass, an escalating direct-service requirement, and a same-day manual-labor discipline system called JUG apply to everyone, Catholic or not. Families who want exactly that structure get an unusually coherent school for the money, and non-Catholic families demonstrably seek it out. AP-maximizers and the religion-averse should treat the discount as a warning label, not a reason to apply.

Researched 2026-07-04. Citations and claim ledger included in the full dossier.

That is the free excerpt. The full dossier covers what the school's own marketing won't: admissions mechanics and real selectivity, all-in cost and aid behavior, matriculation depth, culture and fit signals, institutional health, every claim cited and dated. Unlock it for $9, or get a $29 Research Pass with 3 dossiers included.

The real comparison is against your public options.

Tuition here runs five figures a year, the question is what it buys over the public schools your address already gives you. A $29 Research Pass unlocks score trends, peer percentiles, competition evidence, gifted-pathway detail, and PTA capacity on every public school in the region, plus 3 full research dossiers for the schools on your shortlist.

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Sources

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