Justin-Siena
Independent Catholic school · Grades 9–12
Napa, CA
4026 Maher St, Napa, CA 94558
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A-Class size
- ACollege-going
- B+Years serving families
- A+Diversity
What stands out
- 98% of graduates go to four-year colleges
In Napa, California, Justin-Siena is an independent Catholic school for students from 9th grade through 12th grade. About 654 students attend, with roughly 14 students per teacher. Its enrollment has held steady since 2015–16. The school is part of the Diocese of Santa Rosa. The school reports that about 98% of its graduates go on to four-year colleges. The school day runs about 7 hours, 180 days a year.
At a glance
- Grades
- Grades 9–12
- Students
- 654
- Teachers
- 46.3 (full-time equivalent)
- Students per teacher
- 14.1
- Boys and girls
- Coed · 333 girls, 321 boys
- Religious affiliation
- Catholic · Independent Catholic school
- Diocese
- Diocese of Santa Rosa
- School day
- About 7 hours
- School year
- 180 days
- Graduates going to 4-year colleges
- About 98% (the school's estimate for the class before the survey)
Reviews
Be the first to share what you love about Justin-Siena.
How it compares
- Larger than 66% of Catholic high schools in California.
- Compared with 86 Catholic high schools in California.
Students by survey year
Total students reported in official records since 2015–16.
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 Justin-Siena
What grades does Justin-Siena serve?
Justin-Siena serves grades 9–12.
How many students attend Justin-Siena?
About 654 students, with 14 students per teacher, according to official records.
How much is tuition at Justin-Siena?
Call the school to ask about tuition, financial aid and payment plans.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
Other private schools nearby
St. Apollinaris School
Diocesan school · Grades Pre-K–8
Growing: enrollment up 25% since 2011–12
Napa, CA0.5 mi
Napa Montessori Children's House
Montessori school · Kindergarten only
The only preschool in Napa
Napa, CA0.5 mi
St. John's Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
Serving families in Napa since at least 2011
Napa, CA0.7 mi
Sunrise Montessori of Napa Valley
Montessori school · Grades Pre-K–5
The only Montessori school in Napa
Napa, CA1.1 mi
Veritas Christian Academy
Christian school (nondenominational) · Grades Pre-K–8
Smaller classes than 66% of Christian schools in California
Napa, CA2.2 mi
Blue Oak School
Alternative school · Grades Pre-K–8
Serving families in Napa since at least 2011
Napa, CA2.8 mi