St. John the Baptist Diocesan High School
Diocesan school · Grades 9–12
West Islip, NY
1170 Montauk Hwy, West Islip, NY 11795
Overall grade: A
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- BClass size
- ACollege-going
- A-Years serving families
- A-Diversity
What stands out
- 100% of graduates go to four-year colleges
- Serving families in West Islip since at least 2011
In West Islip, New York, St. John the Baptist Diocesan High School is a Catholic diocesan school for students from 9th grade through 12th grade. About 969 students attend, with roughly 15 students per teacher. It has been listed in official private school records since 2011–12. The school is part of the Diocese of Rockville Centre. The school reports that about 100% 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
- 969
- Teachers
- 64.8 (full-time equivalent)
- Students per teacher
- 15
- Boys and girls
- Coed · 509 girls, 460 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Diocese of Rockville Centre
- School day
- About 7 hours
- School year
- 180 days
- Graduates going to 4-year colleges
- About 100% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Larger than 92% of Catholic high schools in New York.
- Compared with 64 Catholic high schools in New York.
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. John the Baptist Diocesan High School
What grades does St. John the Baptist Diocesan High School serve?
St. John the Baptist Diocesan High School serves grades 9–12.
How many students attend St. John the Baptist Diocesan High School?
About 969 students, with 15 students per teacher, according to official records.
How much is tuition at St. John the Baptist Diocesan High 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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