St. Monica School
Diocesan school · Grades Pre-K–12
Mercer Island, WA
4320 87th Ave SE, Mercer Island, WA 98040
Overall grade: B+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A-Class size
- BYears serving families
- ADiversity
What stands out
- The only Catholic school in Mercer Island
- One school from pre-K through 12th grade
St. Monica School is a Catholic diocesan school in Mercer Island, Washington, for students from pre-K through 12th grade. It has about 222 students and around 10 students per teacher. The school is part of the Archdiocese of Seattle. Students attend about 7 hours a day, 180 days a year.
At a glance
- Grades
- Grades Pre-K–12
- Students
- 222
- Teachers
- 22.9 (full-time equivalent)
- Students per teacher
- 9.7
- Boys and girls
- Coed · 103 girls, 119 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Archdiocese of Seattle
- School day
- About 7 hours
- School year
- 180 days
- Library
- Yes
Reviews
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How it compares
- Smaller classes than 53% of Catholic schools nationwide (10 students per teacher).
- A smaller school: fewer students than 70% of Catholic schools nationwide.
- Compared with 384 Catholic schools nationwide.
Students by grade
Student body
Member of
- National Catholic Educational Association
Questions to ask on a tour
- What is tuition, and what does it include (books, fees, uniforms, trips)?
- Do you offer financial aid, sibling discounts or payment plans?
- Do you accept ESA, voucher or tax-credit scholarship funds?
- How big are classes in my child's grade?
- What support is there for students who need extra help or more challenge?
- Is the school accredited, and by whom?
- What do a typical day and a typical week look like?
- How does the school communicate with families?
Questions about St. Monica School
What grades does St. Monica School serve?
St. Monica School serves grades Pre-K–12.
How many students attend St. Monica School?
About 222 students, with 10 students per teacher, according to official records.
How much is tuition at St. Monica School?
Call the school to ask about tuition, financial aid and payment plans.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
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