St. Teresa High School
Independent Catholic school · Grades 7–12
Decatur, IL
2710 N Water St, Decatur, IL 62526
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
- The smallest classes of any Catholic school in Decatur
- Smaller classes than 90% of Catholic schools in Illinois
- The largest Catholic school in Decatur
- 98% of graduates go to four-year colleges
In Decatur, Illinois, St. Teresa High School is an independent Catholic school for students from 7th grade through 12th grade. About 237 students attend, with roughly 9 students per teacher, smaller classes than 90% of Catholic high schools in Illinois. The school is part of the Diocese of Springfield. The school reports that about 98% of its graduates go on to four-year colleges. The school day runs about 6.5 hours, 176 days a year.
At a glance
- Grades
- Grades 7–12
- Students
- 237
- Teachers
- 26.5 (full-time equivalent)
- Students per teacher
- 8.9
- Boys and girls
- Coed · 151 girls, 86 boys
- Religious affiliation
- Catholic · Independent Catholic school
- Diocese
- Diocese of Springfield
- School day
- About 6.5 hours
- School year
- 176 days
- Graduates going to 4-year colleges
- About 98% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Smaller classes than 90% of Catholic high schools in Illinois (9 students per teacher).
- A smaller school: fewer students than 71% of Catholic high schools in Illinois.
- Compared with 51 Catholic high schools in Illinois.
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. Teresa High School
What grades does St. Teresa High School serve?
St. Teresa High School serves grades 7–12.
How many students attend St. Teresa High School?
About 237 students, with 9 students per teacher, according to official records.
How much is tuition at St. Teresa 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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