St. Mary School
Diocesan school · Grades Pre-K–8
Williamstown, NJ
32A Carroll Ave, Williamstown, NJ 08094
Overall grade: B+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A-Class size
- A-Years serving families
- B+Diversity
What stands out
- Serving families in Williamstown since at least 2011
In Williamstown, New Jersey, St. Mary School is a Catholic diocesan school for students from pre-K through 8th grade. About 344 students attend, with roughly 12 students per teacher. It has been listed in official private school records since 2011–12. The school is part of the Diocese of Camden. The school day runs about 6.5 hours, 180 days a year.
At a glance
- Grades
- Grades Pre-K–8
- Students
- 344
- Teachers
- 28.5 (full-time equivalent)
- Students per teacher
- 12.1
- Boys and girls
- Coed · 154 girls, 190 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Diocese of Camden
- School day
- About 6.5 hours
- School year
- 180 days
- Library
- Yes
Reviews
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How it compares
- Larger than 84% of Catholic elementary schools in New Jersey.
- Compared with 120 Catholic elementary schools in New Jersey.
Students by survey year
Total students reported in official records since 2011–12.
Students by grade
Student body
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. Mary School
What grades does St. Mary School serve?
St. Mary School serves grades Pre-K–8.
How many students attend St. Mary School?
About 344 students, with 12 students per teacher, according to official records.
How much is tuition at St. Mary 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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