St. Catherine of Siena School
Diocesan school · Grades Pre-K–8
Martinez, CA
604 Mellus St, Martinez, CA 94553
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A-Class size
- B+Years serving families
- A+Diversity
What stands out
- Serving families in Martinez since at least 2011
In Martinez, California, St. Catherine of Siena School is a Catholic diocesan school for students from pre-K through 8th grade. About 143 students attend, with roughly 17 students per teacher. The school is part of the Diocese of Oakland. The school day runs about 7 hours, 180 days a year.
At a glance
- Grades
- Grades Pre-K–8
- Students
- 143
- Teachers
- 8.4 (full-time equivalent)
- Students per teacher
- 17
- Boys and girls
- Coed · 71 girls, 72 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Diocese of Oakland
- School day
- About 7 hours
- School year
- 180 days
- Library
- Yes
Reviews
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How it compares
- A smaller school: fewer students than 81% of Catholic elementary schools in California.
- Compared with 416 Catholic elementary schools in California.
Students by survey year
Total students reported in official records since 2011–12.
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. Catherine of Siena School
What grades does St. Catherine of Siena School serve?
St. Catherine of Siena School serves grades Pre-K–8.
How many students attend St. Catherine of Siena School?
About 143 students, with 17 students per teacher, according to official records.
How much is tuition at St. Catherine of Siena 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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