St. Mark's High School
Diocesan school · Grades 9–12
Wilmington, DE
2501 Pike Creek Rd, Wilmington, DE 19808
Overall grade: B
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- BClass size
- ACollege-going
- B+Years serving families
- B+Diversity
What stands out
- The largest of 15 Catholic schools in Delaware
- The largest Catholic school in Wilmington
- 99% of graduates go to four-year colleges
- Serving families in Wilmington since at least 2011
St. Mark's High School is a Catholic diocesan school in Wilmington, Delaware, for students from 9th grade through 12th grade. It has about 829 students and around 17 students per teacher. The school is part of the Diocese of Wilmington. The school reports that about 99% of its graduates go on to four-year colleges. Students attend about 6.5 hours a day, 179 days a year.
At a glance
- Grades
- Grades 9–12
- Students
- 829
- Teachers
- 50 (full-time equivalent)
- Students per teacher
- 16.6
- Boys and girls
- Coed · 430 girls, 399 boys
- Religious affiliation
- Catholic · Diocesan school
- Diocese
- Diocese of Wilmington
- School day
- About 6.5 hours
- School year
- 179 days
- Graduates going to 4-year colleges
- About 99% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Larger than 85% of Catholic high schools nationwide.
- Compared with 773 Catholic high schools nationwide.
Students by survey year
Total students reported in official records since 2011–12.
Students by grade
Student body
Member of
- National Catholic Educational Association
- National Association of Independent Schools
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. Mark's High School
What grades does St. Mark's High School serve?
St. Mark's High School serves grades 9–12.
How many students attend St. Mark's High School?
About 829 students, with 17 students per teacher, according to official records.
How much is tuition at St. Mark's 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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